Houbart, M., Fagnard, J.-F., Dular, J., Dennis, A. R., Namburi, D. K., Durrell, J. H., Geuzaine, C., Vanderheyden, B., & Vanderbemden, P. (November 2023). How to overcome the demagnetization of superconducting Halbach arrays? Superconductor Science and Technology, 36 (11), 115012. doi:10.1088/1361-6668/acf904
Assembling trapped-field superconducting magnets with mutually orthogonal magnetizations directions in a Halbach array configuration offers the prospect of generating both high fields and large field gradients. A major issue when assembling bulk superconductors in a Halbach array, however, consis...
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Rotheudt, N., Dular, J., Geuzaine, C., Fagnard, J.-F., Vanderheyden, B., & Vanderbemden, P. (06 September 2023). Measured and modelled vectorial flux density generated by an eye-shaped magnet [Paper presentation]. 16th European Conference on Applied Superconductivity, Bologna, Italy.
Persistent current loops of arbitrary size can be built from second-generation high-Tc superconducting (2G-HTS) coated conductors. Such ‘eye-shaped’ loops are obtained by milling a slit along the central line of a tape section and extending both sides around a cylinder. These structures can serve...
Peer reviewed
Vanderbemden, P., Fagnard, J.-F., Harmeling, P., & Rotheudt, N. (06 September 2023). A 3-axis Hall sensor device operating at liquid nitrogen temperature [Poster presentation]. 16th European Conference on Applied Superconductivity, Bologna, Italy.
This communication reports the design and the realization of a sensor able to measure the three components of the magnetic flux density B at 77 K above the mT range. While measuring B in these conditions is fundamental in several applications involving high-temperature superconductors, finding ma...
Peer reviewed
Brialmont, S., Fagnard, J.-F., Fracasso Michela, Gozzelino Laura, Yang Pengtao, Yang Wanmin, & Vanderbemden, P. (04 September 2023). Screening of the stray magnetic field of a large bore superconducting magnet [Paper presentation]. 16th European Conference on Applied Superconductivity, Bologne, Italy.
Peer reviewed
Houbart, M., Fagnard, J.-F., Dular, J., Dennis, A., Namburi, D., Durrell, J., Geuzaine, C., Vanderheyden, B., & Vanderbemden, P. (04 September 2023). Alternative assembly process of superconducting linear Halbach array [Poster presentation]. EUCAS 2023, Bologne, Italy.
Large magnetic forces can be achieved with a compact system by combining several permanent magnets with non-parallel magnetization directions in a so-called “Halbach array”. The saturation magnetization of the magnets involved is however a fundamental limitation impeding the performance of this c...
Peer reviewed
Rotheudt, N., Houbart, M., Fagnard, J.-F., & Vanderbemden, P. (01 September 2023). Design of a bespoke 3-axis cryogenic Hall probe and application to measuring the flux density produced by bulk superconductors with a triangular cross-section [Paper presentation]. 13th International Workshop on Processing and Applications of Superconducting (RE)BCO Materials, Caen, France.
Mapping simultaneously the three components of the magnetic flux density B at 77 K and above the mT range is of particular significance in several applications involving high-temperature superconductors. However, finding Hall probes operating in these conditions is nowadays almost impossible. Hen...
Peer reviewed
Wens, T., Laurent, P., Fagnard, J.-F., Greffe, C., & Vanderbemden, P. (01 September 2023). Deepening the theoretical understanding of vector inversion generators. Journal of Applied Physics, 134 (9). doi:10.1063/5.0165176
Vector inversion generators or spiral generators are compact, high voltage pulse generators consisting of a pair of conducting foils wound in a spiral and a switch. We developed an improved analytical model predicting the time evolution of the output voltage of such spiral generators. Our model (...
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Houbart, M., Rotheudt, N., Fagnard, J.-F., Dular, J., Dennis, A., Namburi, D., Durrel, J., Geuzaine, C., Vanderheyden, B., & Vanderbemden, P. (31 August 2023). Overcoming the demagnetization of superconducting linear Halbach array [Paper presentation]. PASREG 2023, Caen, France.
Combining trapped-field superconducting magnets with mutually orthogonal magnetization directions in a linear Halbach array configuration offers the prospect of generating both high fields and large field gradients. For a Halbach array made of 3 magnetized bulk large grain melt-textured YBa2Cu3O7...
Peer reviewed
Fagnard, J.-F., Boilet, L., Erauw, J.-P., Henrotte, F., Geuzaine, C., Vertruyen, B., & Vanderbemden, P. (23 August 2023). Use of partial discharges measurements and video recordings to investigate the influence of relative humidity on zinc oxide subjected to high electric fields. Journal of Physics: D Applied Physics, 56 (46), 465305. doi:10.1088/1361-6463/acee8e
This study investigates the influence of humidity on the high voltage behaviour of zinc oxide porous pellets at room temperature, using the phase resolved partial discharge (PRPD) method. The experimental configuration corresponds to the one that would be used for flash sintering cylindrical ZnO ...
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Houbben, M., Sànchez, C. P., Vanderbemden, P., Noels, L., & Jérôme, C. (13 June 2023). MWCNTs filled PCL covalent adaptable networks: towards reprocessable, self-healing and fast electrically-triggered shape-memory composites. Polymer, 278, 125992. doi:10.1016/j.polymer.2023.125992
Electrically triggered shape memory polymers efficiency has been proven by numerous studies making them promising novel structural materials for high-end applications. In this field, poly(ε-caprolactone) covalent adaptable networks (PCL-CAN) are particularly appealing since they benefit from exce...
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Vanderbemden, P. (06 June 2023). Méthodes de mesures magnétiques par susceptibilité AC [Paper presentation]. Ecole thématique CNRS de magnétométrie, Grenoble, France.
Rotheudt, N., Fagnard, J.-F., Harmeling, P., & Vanderbemden, P. (23 May 2023). Adapting a commercial integrated circuit 3-axis Hall sensor for measurements at low temperatures: mapping the three components of B in superconducting applications. Cryogenics, 133, 103693. doi:10.1016/j.cryogenics.2023.103693
Mapping the magnitude and the direction of the flux density B at cryogenic temperature is of particular interest in numerous applications involving superconductors. However, it is difficult to find 3-axis Hall probes or magnetometers operating at low temperature and above the mT range. In this wo...
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Brialmont, S., Dular, J., Wera, L., Fagnard, J.-F., Vanderheyden, B., Geuzaine, C., Hahn, S., Patel, A., & Vanderbemden, P. (12 April 2023). Magnetic shielding up to 0.67 T at 77 K using a stack of high temperature superconducting tape annuli of 26 mm bore. Superconductor Science and Technology, 36, 054004. doi:10.1088/1361-6668/acc981
In this work we demonstrate the magnetic shielding ability of a stack of YBa2Cu3O7 (YBCO) tape annuli. The annuli are cut from a 46 mm wide second generation coated conductor deposited on a Ni-5at.%W alloy ferromagnetic substrate. The inner bore of the stacked tapes is 26 mm and the outer diamete...
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Fagnard, J.-F., Gajdowski Caroline, Boilet Laurent, Erauw Jean-Pierre, Henrotte, F., Geuzaine, C., & Vanderbemden, P. (20 March 2023). Use of phase resolved partial discharges for studying the incubation period of room temperature flash sintering of zinc oxide [Poster presentation]. Electric Field Enhanced Processing of Advanced Materials III: Complexities and Opportunities, Tomar, Portugal.
Several attempts have been reported in the recent literature to lower the temperature of the flash sintering process. Flash sintering on zinc oxide was successfully carried out at room temperature under high electric fields by controlling the atmosphere (nature of the gas, pressure, humidity). In...
Peer reviewed
Gillis, T., Fagnard, J.-F., & Vanderbemden, P. (20 March 2023). Development of a microcontroller-based phase resolved partial discharge measurement system with application to the monitoring of flash sintering discharge patterns [Poster presentation]. Electric Field Enhanced Processing of Advanced Materials III: Complexities and Opportunities, Tomar, Portugal.
The context of this research is the development of a tool that can help understand the mechanisms of the incubation period in flash sintering carried out under high electric fields. It has been recently shown that the measurement of partial discharge (PD) patterns is a useful method to monitor th...
Peer reviewed
Brialmont, S., Fagnard, J.-F., Dular, J., Yang, P., Yang, W., Patel, A., Hahn, S., Geuzaine, C., Vanderheyden, B., & Vanderbemden, P. (2023). Magnetic Shields of Various Shapes Combining Bulk Superconductors and Tapes [Paper presentation]. 8th International Conference on Superconductivity and Magnetism- ICSM2023.
Peer reviewed
Pereira Sanchez, C. A., Jérôme, C., Noels, L., & Vanderbemden, P. (02 November 2022). Review of Thermoresponsive Electroactive and Magnetoactive Shape Memory Polymer Nanocomposites. ACS Omega, 7 (45), 40701-40723. doi:10.1021/acsomega.2c05930
Electroactive and magnetoactive shape memory polymer nanocomposites (SMCs) are multistimuli-responsive smart materials that are of great interest in many research and industrial fields. In addition to thermoresponsive shape memory polymers, SMCs include nanofillers with suitable electric and/or m...
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Brialmont, S., Fagnard, J.-F., Vanderheyden, B., Mazaleyrat, F., Hahn, S., Patel, A., & Vanderbemden, P. (18 August 2022). Measurement of Magnetic Hysteresis Loops of the Ni-5at.%W Alloy substrate as a Function of Temperature in a Stack of 2G HTS-Coated Conductor Annuli. IEEE Transactions on Applied Superconductivity, 32 (8), 6602710. doi:10.1109/TASC.2022.3199928
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Pereira Sanchez, C. A., Houbben, M., Fagnard, J.-F., Laurent, P., Jérôme, C., Noels, L., & Vanderbemden, P. (August 2022). Joule resistive heating of a shape memory composite : some design rules to predict the temperature in samples with rectangular cross-section (invited) [Paper presentation]. 22nd international school on condensed matter physics : State of the Art in Functional Materials & Technologies, Varna, Bulgaria.
Shape memory polymers (SMP) and their composites (SMC) are materials exhibiting morphing capabilities that can be applied to numerous applications, including aerospace or biomedical engineering. The changes of shape of the material are triggered by modifying its temperature. Amongst the possible ...
Peer reviewed
Pereira Sanchez, C. A., Houbben, M., Fagnard, J.-F., Harmeling, P., Jérôme, C., Noels, L., & Vanderbemden, P. (2022). Experimental characterization of the thermo-electro-mechanical properties of a shape memory composite during electric activation. Smart Materials and Structures. doi:10.1088/1361-665x/ac8297
This works investigates in detail the electro-thermo-mechanical properties of a Shape Memory Composite (SMC) during shape memory cycles in which the heating is a result of resistive heating. The SMC is a covalently cross-linked poly(ε-caprolactone) network filled with 3 wt% of multiwall carbon na...
Peer reviewed
Vanderbemden, P. (2022). Characterization of Superconductor Magnetic Properties in Crossed Magnetic Fields. In D. A. Cardwell, D. C. Larbalestier (Ed.), ... A. I. Braginski (Ed.), Handbook of Superconductivity Theory, Materials, Processing, Characterization and Applications (3-Volume Set) (2nd edition). CRC Press | Taylor & Francis Group. doi:10.1201/9781003139638
This chapter deals with the characterization of the magnetic properties of superconductors which are subjected to magnetic fields that have been applied along two orthogonal directions, which is commonly referred to as a “crossed” magnetic field configuration. In a classical electromagnetism cont...
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Brialmont, S., Dular, J., Vanderheyden, B., Geuzaine, C., Patel, A., Hahn, S., & Vanderbemden, P. (14 June 2022). Annuli of coated conductors with a ferromagnetic substrate: magnetic shielding properties at 77 K and at room temperature [Paper presentation]. 8th International Workshop on Numerical Modelling of High Temperature Superconductors, Nancy, France.
Peer reviewed
Houbben, M., Pereira Sanchez, C. A., Vanderbemden, P., Noels, L., & Jérôme, C. (13 June 2022). Comprehensive study of adding MWCNT to covalent adaptable networks of PCL towards fast and electrically triggered shape memory remoldable composites [Poster presentation]. Polymer Network Group, Rome, Italy.
Shape memory polymers (SMPs) are smart materials able to switch from a temporary shape (deformed state) to their initial permanent shape (relaxed shape) upon exposure to a stimulus; such as light or heat. Remarkable shape memory properties are especially obtained for covalent networks of semi-cry...
Peer reviewed
Houbart, M., Fagnard, J.-F., Dular, J., Dennis, A., Namburi, D. K., Durrell, J. H., Geuzaine, C., Vanderheyden, B., & Vanderbemden, P. (2022). Trapped magnetic field distribution above a superconducting linear Halbach array. Superconductor Science and Technology. doi:10.1088/1361-6668/ac68a7
Abstract In applications requiring a large magnetic force, permanent magnets with non-parallel magnetization directions can be assembled in a Halbach array to generate a large gradient of magnetic flux density. The saturation magnetization of permanent magnets, however, brings a fu...
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Dular, J., Brialmont, S., Vanderbemden, P., Geuzaine, C., & Vanderheyden, B. (2022). 3D Finite Element Models of Stacked Tapes Magnetic Shields [Paper presentation]. HTS Modelling 2022, Nancy, France.
Peer reviewed
Houbart, M., Fagnard, J.-F., Dular, J., Dennis, A., Namburi, D. K., Durrell, J., Geuzaine, C., Vanderheyden, B., & Vanderbemden, P. (2022). 3D Modelling of the Currents Induced in a Superconducting Linear Halbach array [Paper presentation]. 8th International Workshop on Numerical Modelling of High Temperature Superconductor, Nancy, France.
The combination of permanent magnets in a socalled “Halbach array” is a commonly used method to generate large magnetic flux density gradients with a compact system and is of great interest in applications requiring a magnetic force. The maximum magnetic force achievable with such systems is, how...
Peer reviewed
Pereira Sanchez, C. A., Houbben, M., Fagnard, J.-F., Laurent, P., Jérôme, C., Noels, L., & Vanderbemden, P. (2022). Resistive Heating of a Shape Memory Composite: Analytical, Numerical and Experimental Study. Smart Materials and Structures, 31 (2), 025003. doi:10.1088/1361-665X/ac3ebd
This work investigates in detail the Joule resistive heating phenomenon of electroactive Shape Memory Composites (SMC) when an electric current is injected at constant power. The SMC is a covalent poly(ε-caprolactone) network filled with 3 wt% of multiwall carbon nanotubes. The resistive heating ...
Peer reviewed
Houbart, M., Fagnard, J.-F., Namburi, D. K., Dennis, A., Shi, Y., Durrell, J., & Vanderbemden, P. (13 November 2021). Behaviour of neighbouring bulk trapped field magnets with parallel or orthogonal magnetizations [Paper presentation]. 12th International Workshop on Processing and Applications of Superconducting Bulk Materials, Shanghai, China.
This presentation deals with the behaviour of bulk superconductors used as trapped-field permanent magnets. We investigate the situation where the bulk superconductors are first magnetized permanently and then brought next to each other, in view of generating a large magnetic flux density gradien...
Peer reviewed
Vanderbemden, P. (12 October 2021). Magnetometry : AC susceptibility measurements [Paper presentation]. Ecole thématique CNRS sur les mesures magnétiques, Caen, France.
Houbart, M., Fagnard, J.-F., Namburi, D. K., Dennis, A., Durrell, J., & Vanderbemden, P. (05 September 2021). Trapped magnetic field distribution above a superconducting linear Halbach array [Poster presentation]. 15th European Conference on Applied Superconductivity, Moscou, Russia.
A compact system generating a large gradient of the magnetic flux density is often required in applications involving a magnetic force. One well-documented way to compactly generate such magnetic gradients is to assemble permanent magnets in a Halbach array. However, the saturation magnetization ...
Peer reviewed
Brialmont, S., Fagnard, J.-F., Vanderheyden, B., Hahn, S., Park, S. H., Patel, A., & Vanderbemden, P. (01 September 2021). Measurement of major and minor magnetic hysteresis loops of the Ni-alloy substrate in a stack of 2G coated conductor tapes as a function of temperature [Poster presentation]. 15th European Conference on Applied Superconductivity (EUCAS), Moscou, Russia.
Peer reviewed
Hogan, K., Vanderbemden, P., Vanderheyden, B., Radovinski, A., & Minervini, J. V. (June 2021). Design of a superconducting magnetic shield closed on both ends for a high-sensitivity particle detector [Paper presentation]. 7th International Workshop on Numerical Modelling of High Temperature Superconductors (HTS 2020), Nancy (Virtual), France.
This work deals with the numerical design of a high-efficiency superconducting magnetic shield required for a high-sensitivity particle detector. This research was carried out in the context of the ‘ABRACADABRA’ project aiming at detecting hypothetical elementary particles called axions. Axions a...
Peer reviewed
Fagnard, J.-F., Gajdowski, C., Boilet, L., Henrotte, F., Geuzaine, C., Vertruyen, B., & Vanderbemden, P. (January 2021). Use of partial discharge patterns to assess the quality of sample/electrode contacts in flash sintering. Journal of the European Ceramic Society, 41 (1), 669-683. doi:10.1016/j.jeurceramsoc.2020.07.046
In a flash sintering process, a straightforward way to control the current uniformity through the sample is contacting the sample to the electrodes with platinum paste. This method is however costly for large-scale applications. We show that the in-situ phase resolved partial discharge technique ...
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Fagnard, J.-F., Gajdowski, C., Boilet, L., Henrotte, F., Geuzaine, C., Vertruyen, B., & Vanderbemden, P. (31 August 2020). Partial discharge measurements used as a tool to assess the quality of the electrode contact in flash sintering, Milko Borisov Memorial Lecture [Paper presentation]. 21st International school on condensed matter physics “Progress and Perspectives in Functional Materials”, Varna, Bulgarie.
The measurement of phase-resolved partial discharge patterns is a well-established technique used in electrical engineering to study the degradation of electrically insulating materials placed at high voltage. The measured partial discharge (PD) signal gives information on the physics of the pre-...
Peer reviewed
Brialmont, S., Fagnard, J.-F., & Vanderbemden, P. (July 2020). Use of metallic strain gauges for torque magnetometry : application to the contactless characterization of large magnetized superconducting samples [Paper presentation]. 19th International Conference on Experimental Mechanics ICEM2020, Krakow, Poland.
See attached file
Peer reviewed
Houbart, M., Fagnard, J.-F., Dennis, A., Namburi, D. K., Shi, Y., Durrell, J., & Vanderbemden, P. (01 May 2020). Trapped magnetic field distribution above two magnetized bulk superconductors close to each other. Superconductor Science and Technology, 33. doi:10.1088/1361-6668/ab87ac
Bulk large-grain superconductors can be used as high-field permanent magnets. Although the properties of such individual trapped field magnets are well documented, much less is known concerning their behaviour when two are brought together. In this work, the interaction between two cylindrical bu...
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Szewczyk, D., Stachowiak, P., Mucha, J., Rikel, M., Fagnard, J.-F., & Vanderbemden, P. (07 January 2020). Anisotropy of the thermal conductivity of bulk melt-cast Bi-2212 superconducting tubes. Superconductor Science and Technology, 33, 025006. doi:10.1088/1361-6668/ab601c
We investigate experimentally the anisotropy of the temperature dependence of the thermal conductivity of bulk Bi2Sr2CaCu2O8 (Bi-2212) cylinders fabricated by the melt-cast process. The thermal conductivity kappa(T) along the axial and azimuthal directions are found to be equal within experimenta...
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Houbart, M., Fagnard, J.-F., Dennis, A., Namburi, D. K., Shi, Y., Durrell, J., & Vanderbemden, P. (03 September 2019). Trapped field of two close bulk superconductors with misaligned c-axes [Poster presentation]. EUCAS 2019 - 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom.
The simultaneous magnetisation of two cylindrical bulk YBCO superconductors (diameter 15.7 mm, height 8.8 mm) closely spaced is investigated experimentally. The applied magnetic field is parallel to the c-axis of one of them, while the other has its c-axis directed at different angles with the fi...
Peer reviewed
Brialmont, S., Fagnard, J.-F., & Vanderbemden, P. (01 September 2019). Design and construction of a torque magnetometer for large size superconductors [Poster presentation]. 14th European Conference on Applied Superconductivity (EUCAS), Glasgow, United Kingdom.
Peer reviewed
Brialmont, S., Fagnard, J.-F., & Vanderbemden, P. (29 August 2019). Non-destructive measurement of the magnetic moment of bulk GdBCO samples using a torque magnetometer designed for large size samples [Paper presentation]. 11th International Workshop on Processing and Applications of Superconducting Bulk Materials, Prague, Czechia.
Peer reviewed
Houbart, M., Fagnard, J.-F., Namburi, D. K., Shi, Y., & Vanderbemden, P. (29 August 2019). Trapped field evolution of two approaching bulk superconductors with parallel c-axes [Poster presentation]. International workshop on Processing and Applications of Superconducting Bulk Materials, Prague, Czechia.
Although the properties of individual trapped field magnets are well documented, there is little scientific information concerning their trapped field behaviour when several of them are brought in close vicinity. In this context, the translational approach of two cylindrical bulk YBCO superconduc...
Peer reviewed
Brialmont, S., Fagnard, J.-F., & Vanderbemden, P. (2019). A simple torque magnetometer for magnetic moment measurement of large samples: Application to permanent magnets and bulk superconductors. Review of Scientific Instruments. doi:10.1063/1.5111399
The development of large size magnetic materials requires nondestructive measurement techniques to characterize their magnetic moment. In this work, we report the design and construction of a torque magnetometer able to accommodate sizable magnetic samples (>1 cm³) both at room temperature and cr...
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Fagnard, J.-F., Vanderheyden, B., Pardo, E., & Vanderbemden, P. (06 June 2019). Magnetic shielding of various geometries of bulk semi-closed superconducting cylinders subjected to axial and transverse fields. Superconductor Science and Technology, 32 (7), 074007. doi:10.1088/1361-6668/ab1824
We consider the properties of bulk superconductors to be used as low-frequency passive magnetic shields. Although remarkable shielding properties have been recently achieved using high-temperature superconductors of various kinds, one current issue is to assemble medium-size superconducting parts...
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Vanderbemden, P. (04 June 2019). Magnetometry by AC susceptibility measurements [Paper presentation]. Formation ANF CNRS - Magnétométrie, Nancy, France.
Wéra, L., Fagnard, J.-F., Hogan, K., Vanderheyden, B., Namburi, D. K., Shi, Y., Cardwell, D., & Vanderbemden, P. (April 2019). Magnetic shielding of open and semi-closed bulk superconductor tubes: the role of a cap. IEEE Transactions on Applied Superconductivity, 29 (3), 6801109. doi:10.1109/TASC.2019.2891897
In this paper we investigate the magnetic shielding of hollow and semi-closed bulk superconducting tubes at 77 K. We first consider the properties of a commercial Bi-2223 tube closed by a disk-shaped cap placed against its extremity. The results are compared with those obtained on a bulk large gr...
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Fagnard, J.-F., Gajdowski, C., Boilet, L., Henrotte, F., Geuzaine, C., & Vanderbemden, P. (March 2019). In situ measurements of partial discharge patterns on porous YSZ pellets pressed between planar platinum electrodes used for flash sintering [Poster presentation]. Electric Field Enhanced Processing of Advanced Materials II: Complexities and Opportunities, Tomar, Portugal.
Flash sintering of prismatic or cylindrical samples placed between planar electrodes allows processing larger volumes of material, compared to dogbone-shaped samples. The contact surface with platinum electrodes are usually coated with Pt paste in this setup, in order to improve the galvanic cont...
Peer reviewed
Yang, P., Fagnard, J.-F., Vanderbemden, P., & Yang, W. (2019). Magnetic shielding of short thick GdBCO tube fabricated by the buffer aided TSIG method. Superconductor Science and Technology, 32, 115015. doi:10.1088/1361-6668/ab4309
Melt-textured (RE)Ba2Cu3O7 superconductors (where RE is a rare earth element like Y, Gd or Dy) have a significant potential for passive magnetic shielding. Their critical current density Jc, however, is not uniform throughout the sample and this fact needs to be taken account to design a large ma...
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Hogan, K., Fagnard, J.-F., Wera, L., Vanderheyden, B., & Vanderbemden, P. (21 November 2018). Bulk superconducting tube subjected to the stray magnetic field of a solenoid. Superconductor Science and Technology, 31, 015001. doi:10.1088/1361-6668/aa9651
Hard type-II hollow superconductors are well suited for low frequency magnetic shielding. The properties and performances of superconducting magnetic shields subjected to homogeneous magnetic fields have been extensively discussed in the literature. In the present work, we investigate the magneti...
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Vanderbemden, P., Philippe, M., Wéra, L., Shi, Y., Dennis, A., Cardwell, D., Fagnard, J.-F., Vanderheyden, B., & Egan, R. (18 October 2018). Mesures magnétiques : comment concevoir un magnétomètre adapté aux échantillons de grande taille ? [Paper presentation]. Atelier 2018 du réseau francophone de magnétométrie, Paris, France.
Les magnétomètres commerciaux traditionnels sont adaptés pour mesurer le moment magnétique d'échantillons de taille relativement réduite, en général < 1cm³. Pour certains matériaux cependant, il est désirable de pouvoir déterminer le moment magnétique d'échantillons plus volumineux de manière non...
Durrell, J. H., Ainslie, M. D., Zhou, D., Vanderbemden, P., Bradshaw, T., Speller, S., Filipenko, M., & Cardwell, D. A. (October 2018). Bulk superconductors: a roadmap to applications. Superconductor Science and Technology, 31, 103501. doi:10.1088/1361-6668/aad7ce
Progress in superconducting bulk materials has been somewhat overshadowed by the considerable effort required to produce practical long-length conductors. There has, however, been steady progress in both the materials science of bulk superconducting materials and the technologies required to use ...
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Li, J., Xiong, R., Mu, H., Cornélusse, B., Vanderbemden, P., Ernst, D., & Yuan, W. (May 2018). Design and real-time test of a hybrid energy storage system in the microgrid with the benefit of improving the battery lifetime. Applied Energy, 218, 470-478. doi:10.1016/j.apenergy.2018.01.096
This study proposes a hybrid energy storage system (HESS) composed of the superconducting energy storage system (SMES) and the battery. The system is designed to compensate power fluctuations within a microgrid. A novel control method is developed to share the instantaneous power between the SMES...
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Vanderheyden, B., Fagnard, J.-F., Hogan, K., Philippe, M., & Vanderbemden, P. (30 April 2018). FEM Simulations of Crossed-field Effects in Bulk Superconducting Trapped-field Permanent Magnets [Paper presentation]. ICSM 2018 6th International Conference on Superconductivity and Magnetism, Antalya, Turkey.
Bulk (RE)BCO samples can be used as efficient permanent magnets achieving trapped flux densities of a few teslas at 77 K. However, their magnetization decays over time when subjected to crossed fields (with a direction perpendicular to the initially trapped flux density). Such parasitic field may...
Peer reviewed
Satpathy, K., Duchesne, A., Dubois, C., Fagnard, J.-F., Caps, H., Vanderbemden, P., & Vanderheyden, B. (2018). Study of buoyancy driven heat transport in silicone oils and in liquid nitrogen in view of cooling applications. International Journal of Heat and Mass Transfer, 118, 538-550. doi:10.1016/j.ijheatmasstransfer.2017.11.017
Motivated by applications for cooling superconducting pellets with liquid nitrogen, we consider a source with a fixed heating rate per unit volume, immersed in a liquid pool and cooled through natural convection. In one recent experimental investigation (Dubois et al., 2016) carried on silicone o...
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Shaw, G., Brisbois, J., Pinheiro, L. B. G. L., Müller, J., Blanco Alvarez, S., Devillers, T., Dempsey, N. M., Scheerder, J. E., Van de Vondel, J., Melinte, S., Vanderbemden, P., Motta, M., Ortiz, W. A., Hasselbach, K., Kramer, R. B. G., & Silhanek, A. (2018). Quantitative magneto-optical investigation of superconductor/ferromagnet hybrid structures. Review of Scientific Instruments, 89, 23705. doi:10.1063/1.5016293
We present a detailed quantitative magneto-optical imaging study of several superconductor/ ferromagnet hybrid structures, including Nb deposited on top of thermomagnetically patterned NdFeB, and permalloy/niobium with erasable and tailored magnetic landscapes imprinted in the permalloy layer. Th...
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Szewczyk, D., Thaljaoui, R., Mucha, J., Stachowiak, P., & Vanderbemden, P. (2018). Specific heat and magnetocaloric effect in Pr0.6Sr0.4−xAgxMnO3 manganites. Intermetallics, 102, 88-93. doi:10.1016/j.intermet.2018.09.002
The detailed investigation on the specific heat in manganites of Pr0.6Sr0.4−xAgxMnO3 (x=0.05 and x=0.1) has been reported. The experimental conditions were: the temperature range 1.8–330 K and applied magnetic fields of 0, 1, 2 and 3 T. Specific heat results confirmed two phase transitions, a str...
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Wéra, L., Fagnard, J.-F., Hogan, K., Vanderheyden, B., & Vanderbemden, P. (2018). The influence of an initial trapped field on the magnetic shielding performance of bulk high-temperature superconducting tubes. In M. Miryala & M. Koblischka (Eds.), High-Temperature Superconductors: Occurrence, Synthesis and Applications (pp. 75-94). New-York, United States: Nova Science.
Type-II superconducting hollow cylinders can act as efficient passive magnetic shields. Unlike in ferromagnetic materials, the magnetic shielding mechanism in a superconductor occurs through persistent currents flowing on the macroscopic scale. When a superconducting tube is used to shield a sequ...
Peer reviewed
Hogan, K., Wera, L., Fagnard, J.-F., & Vanderbemden, P. (11 December 2017). Investigation of the shielding properties of a Bi-2212 bulk superconducting tube subjected to an inhomogeneous magnetic field at various temperatures [Poster presentation]. 10th International Workshop Processing and Applications of Superconduting (RE)BCO Large Grain Materials, Tokyo, Japon, Japan.
Magnetic shielding with bulk superconductors is commonly studied under homogeneous magnetic fields. This configuration simplifies the analysis of the magnetic reaction of the superconductor as the applied magnetic field is known precisely everywhere. In practical applications, however, the magnet...
Vanderbemden, P., Wera, L., Hogan, K., Vanderheyden, B., Fagnard, J.-F., Namburi, D. K., Shi, Y. H., & Cardwell, D. A. (11 December 2017). Magnetic shielding of open and semi-closed tubes made of bulk superconductors : the role of a cap [Paper presentation]. The 10th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials (PASREG 2017), Tokyo, Japan.
Amongst the range of prospective applications for bulk superconductors, the shielding of high magnetic fields at low frequency is extremely promising. Unlike conventional high permeability ferromagnetic materials which exhibit a relatively low saturation magnetization (e.g. µ0Msat ~ 0.75 T for mu...
Peer reviewed
Satpathy, K., Dubois, C., Duchesne, A., Fagnard, J.-F., Caps, H., Vanderbemden, P., & Vanderheyden, B. (20 September 2017). Studies on convective cooling of cryogenic fluids towards superconducting applications. WIT Transactions on Engineering Sciences, 118, 95-106. doi:10.2495/CMEM170101
To understand the cooling aspect through natural convection in a cryogenic fluid interacting with a constant heat source, numerical simulations are carried out in a parallelepiped enclosure. The 3D form of N-S equations is solved to obtain the detailed flow features through path line profiles, is...
Peer reviewed
Vanderheyden, B., Fagnard, J.-F., Hogan, K., & Vanderbemden, P. (20 September 2017). Model for the response of superconducting/ferromagnetic structures subjected to crossed fields [Poster presentation]. EUCAS 2017 - 13th European Conference on Applied Superconductivity, Geneva, Switzerland.
Bulk (RE)BCO samples can be used as efficient permanent magnets with trapped magnetic flux densities of a few teslas at 77 K. However, their magnetization may decay over time when subjected to time-varying parasitic fields perpendicular to the initial trapped flux density. In this work, we consid...
Vanderbemden, P., Philippe, M., Wera, L., Hogan, K., Vanderheyden, B., & Fagnard, J.-F. (10 July 2017). Non-destructive investigation of hybrid of ferromagnet /(RE)BCO large grain bulks by flux extraction magnetometry and levitation force [Paper presentation]. Cryogenic Engineering Conference and International Cryogenic Material Conference (CEC-ICMC 2017), Madison, United States.
This work deals with bulk, large grain superconductors used as permanent magnet for rotating machines or levitation applications. It has recently been shown that the magnetic properties of bulk large grain superconductors can be improved easily by attaching a short section of a soft ferromagnetic...
Peer reviewed
Vanderbemden, P. (27 June 2017). Instrumentation, magnetic and electrical characterization of superconductors [Paper presentation]. ESAS summer school 2017, Lans-en-Vercors, France.
Wera, L., Fagnard, J.-F., Kumar, N. D., Shi, Y., Vanderheyden, B., & Vanderbemden, P. (June 2017). Magnetic Shielding Above 1 T at 20 K With Bulk, Large Grain YBCO Tubes Made by Buffer-aided Top Seeded Melt Growth. IEEE Transactions on Applied Superconductivity, 27 (4). doi:10.1109/TASC.2016.2633301
YBCO tubes of ~ 10 mm diameter closed at one extremity were engineered by a Buffer-Aided Top Seeded Melt Growth fabrication process (BA-TSMG). These tubes can act as efficient “dc” magnetic shields and are observed to reduce axial flux densities of 1.5 T by a factor of 100 at 20 K. Such performan...
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Li, J., Cornélusse, B., Vanderbemden, P., & Ernst, D. (2017). A SC/battery Hybrid Energy Storage System in the Microgrid. Energy Procedia, 142, 3697–3702. doi:10.1016/j.egypro.2017.12.264
The major challenges in power systems are driven by the energy shortage and environmental concerns, namely facilitating the penetration of renewable energy and improving the efficiency of the renewable powers. Due to the variable nature of renewables, the generated power profile may not be able t...
Peer Reviewed verified by ORBi
Thaljaoui, R., Pękała, M., Fagnard, J.-F., & Vanderbemden, P. (2017). Effect of Ag substitution on structural, magnetic and magnetocaloric properties of Pr0.6Sr0.4– xAgxMnO3 manganites. Journal of Rare Earths, 35 (9), 875-882. doi:10.1016/S1002-0721(17)60989-X
A systematic investigation on the structural, magnetic and magnetocaloric properties of Pr0.6Sr0.4–xAgxMnO3 (x=0.05 and 0.1) manganites was reported. Rietveld refinements of the X-ray diffraction patterns confirmed that all samples were single phase and crystallized in the orthorhombic structure ...
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Yang, Q., Le Blond, S., Cornélusse, B., Vanderbemden, P., & Li, J. (2017). A Novel Fault Detection and Fault Location Method for VSC-HVDC Links Based on Gap Frequency Spectrum Analysis. Energy Procedia, 142, 2243-2249. doi:10.1016/j.egypro.2017.12.625
This paper proposes a one-end gap-based fault location method for VSC-HVDC transmission line using the fault current signal. Using the post-fault current time series, the frequency spectrum is generated for measuring the gaps between the contiguous peak frequencies. This method is able to locate ...
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Vanderbemden, P., Caps, H., Vanderheyden, B., & Fagnard, J.-F. (10 November 2016). Behaviour of bulk superconducting trapped field magnets subjected to magnetic fields with a transverse component [Paper presentation]. 1st Asian ICMC (International Cryogenic Materials Conference ) - CSSJ (Cryogenics and Superconductivity Society of Japan) 50th Anniversary Conference, Kanazawa, Japan.
Bulk superconductors can be used as trapped field magnets with unprecedented performances. Such trapped field magnets find a variety of engineering applications, in particular for brushless rotating machines and levitation devices. Compared to conventional permanent magnets, however, the magnetic...
Peer reviewed
Wera, L., Fagnard, J.-F., Hogan, K., Vanderheyden, B., & Vanderbemden, P. (09 November 2016). Bulk high-temperature superconducting hollow cylinders used for magnetic shielding: effect of an initial trapped field on the shielding performances [Poster presentation]. 1st Asian ICMC - CSSJ 50th Anniversary Conference, Kanazawa, Japan.
Bulk High-Temperature Superconductors (HTS) can be used as efficient passive magnetic shields with performances exceeding those of conventional ferromagnetic materials. The most common geometry for a superconducting shield is a bulk hollow cylinder. In this work, we investi...
Wera, L., Fagnard, J.-F., Kumar, N. D., Shi, Y., Vanderheyden, B., & Vanderbemden, P. (07 September 2016). Magnetic shielding above 1 T at 20 K with bulk, large grain YBCO tubes made by Buffer-aided Top Seeded Melt Growth [Poster presentation]. Applied Superconductivity Conference ASC 2016, Denver, United States.
A superconducting tube can be used as an efficient magnetic shield. The best shielding performance levels are usually achieved when the tube is closed at one or both extremities. The purpose of the present work is to study experimentally the shielding performance of YBCO tubes obtained by Buffer-...
Vanderbemden, P., Egan, R., Morita, M., Teshima, H., Nariki, S., Vanderheyden, B., & Fagnard, J.-F. (05 September 2016). Non-destructive measurements of the volume magnetic behavior of large bulk GdBCO single domains and ferromagnet/superconductor structures [Paper presentation]. ASC 2016 Applied Superconductivity Conference, Denver, CO, United States.
The present work deals with magnetic measurements on bulk large grain GdBa2Cu3O7 (GdBCO) single domains using a recently constructed bespoke magnetometer [Rev. Sci. Instrum. 86 025107 (2015)]. The device enables the measurement of magnetic moments as large as 1 Am^2 (1000 emu) on large bulk sampl...
Peer reviewed
Vanderbemden, P., Fagnard, J.-F., Caps, H., Vanderheyden, B., & Philippe, M. (30 August 2016). Superconductors used as trapped field magnets : investigation of hybrid structures combining superconducting and ferromagnetic materials [Paper presentation]. 19th International School on Condensed Matter Physics: "Advances in Nanostructured Condensed Matter:  Research and Innovations", Varna, Bulgaria.
In addition to their unique ability to carry electric currents without loss, superconductors are able to trap significant magnetic flux densities at low temperature. In so-called type-II irreversible superconductors, these properties are due to the pinning of individual flux lines (vortices) by d...
Peer reviewed
Fagnard, J.-F., Morita, M., Teshima, H., Vanderheyden, B., & Vanderbemden, P. (August 2016). Comparison of the magnetization decay due to crossed or rotated magnetic field measured on a Ferromagnet disk/GdBCO pellet structure [Poster presentation]. ASC 2016 - Applied Superconductivity Conference, Denver, United States.
Superconducting (SC) bulk materials are commonly used as permanent magnets in synchronous rotating machines. When the machine is in operation, the bulk materials that are placed in the machine rotor can experience a certain misalignment with the magnetic field generated by the stator. This situat...
Vanderheyden, B., Fagnard, J.-F., Hogan, K., & Vanderbemden, P. (August 2016). Model for the decay of the magnetization of a bulk superconductor for different sources of magnetic fields with a transverse component [Poster presentation]. ASC 2016 - Applied Superconductivity Conference, Denver, United States.
Bulk (RE)BCO samples can be used as efficient trapped-field magnets with surface flux densities of a few teslas. However, their magnetization may decay over time when subjected to time-varying parasitic crossed fields (applied perpendicular to the initially trapped flux density). In this work, we...
Satpathy, K., Dubois, C., Fagnard, J.-F., Caps, H., Vanderbemden, P., & Vanderheyden, B. (16 June 2016). Studies of heat transport in cryogenic fluids toward superconducting applications [Poster presentation]. HTS Modelling 2016 - 5th International workshop on numerical modelling of high-temperature superconductors, Bologna, Italy.
To meet the increasing global energy demand with minimal green house effect, electrical energy is a viable option. But, it requires an efficient electrical power system with optimal loss. Towards this, superconducting materials represent a promising way of improving the existing systems. However,...
Brisbois, J., Motta, M., Avila Osses, J., Shaw, G., Devillers, T., Dempsey, N. M., Veerapandian, S. K. P., Colson, P., Vanderheyden, B., Vanderbemden, P., Ortiz, W. A., Nguyen, N. D., Kramer, R. B. G., & Silhanek, A. (06 June 2016). Imprinting superconducting vortex footsteps in a magnetic layer. Scientific Reports, 6, 27159. doi:10.1038/srep27159
Local polarization of a magnetic layer, a well-known method for storing information, has found its place in numerous applications such as the popular magnetic drawing board toy or the widespread credit cards and computer hard drives. Here we experimentally show that a similar principle can be app...
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Vanderbemden, P., Hogan, K., Wera, L., Vanderheyden, B., & Fagnard, J.-F. (26 April 2016). Magnetic shielding with bulk high-temperature superconducting hollow cylinders: improvement of the shielded volume and investigation of sequential orthogonal applied fields [Paper presentation]. 5th International Conference on Superconductivity and Magnetism (ICSM2016), Fethiye, Turkey.
Due to their ability to trap magnetic fields that exceed the saturation magnetization of conventional ferromagnets, bulk high-temperature superconductors have great potential to act as efficient passive magnetic shields. Shielding efficiency is usually demonstrated in bulk hollow cylinders. One o...
Peer reviewed
Brisbois, J., Adami, O.-A., Avila Osses, J., Motta, M., Ortiz, W. A., Nguyen, N. D., Vanderbemden, P., Vanderheyden, B., Kramer, R. B. G., & Silhanek, A. (23 February 2016). Magnetic flux penetration in Nb superconducting films with lithographically defined micro-indentations. Physical Review. B, 93 (5), 054521.
We present a thorough investigation by magneto-optical imaging of the magnetic flux penetration in Nb thin films with lithographically defined border indentations. We demonstrate that discontinuity lines (d-lines), caused by the abrupt bending of current streamlines around the indentations, depar...
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Dubois, C., Duchesne, A., Vanderheyden, B., Vanderbemden, P., & Caps, H. (2016). Locally induced laminar convection in liquid nitrogen and silicone oils. The European physical journal. E, Soft matter, 39, 79. doi:10.1140/epje/i2016-16079-4
We present an experimental study of a laminar convective phenomenon induced by a centimetric heater totally immersed in a liquid pool (Rayleigh number ranging from 10(4) to 10(7)). This local heating is observed to induce a laminar convection that differs from the classical Rayleigh-Benard cells ...
Peer reviewed
Fagnard, J.-F., Morita, M., Nariki, S., Teshima, H., Caps, H., Vanderheyden, B., & Vanderbemden, P. (2016). Magnetic moment and local magnetic induction of superconducting/ferromagnetic structures subjected to crossed fields: experiments on GdBCO and modelling. Superconductor Science and Technology, 29 (12), 125004. doi:10.1088/0953-2048/29/12/125004
Recent studies have shown that ferromagnetic materials can be used together with bulk high temperature superconductors in order to improve their magnetic trapped field. Remarkably, it has also been pointed out that ferromagnets can help in reducing the crossed field effect, namely the magnetizati...
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Philippe, M., Fagnard, J.-F., Wera, L., Morita, M., Nariki, S., Teshima, H., Caps, H., Vanderheyden, B., & Vanderbemden, P. (2016). Influence of crossed fields in structures combining large grain, bulk (RE)BCO superconductors and soft ferromagnetic discs. Journal of Physics. Conference Series, 695, 012003. doi:10.1088/1742-6596/695/1/012003
Bulk (RE)BCO superconductors are able to trap record magnetic fields and can be used as powerful permanent magnets in various engineering applications such as rotating machines and magnetic bearings. When such superconducting (SC) “trapped field magnets” are combined to a ferromagnetic (FM) disc,...
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Stachowiak, P., Mucha, J., Szewczyk, D., Zhai, Y., Hsu, C. H., Coombs, T. A., Fagnard, J.-F., Philippe, M., & Vanderbemden, P. (2016). Thermal properties of Ti-doped Cu–Zn soft ferrites used as thermally actuated material for magnetizing superconductors. Journal of Physics: D Applied Physics, 49, 125004. doi:10.1088/0022-3727/49/12/125004
A great majority of widely used ferrite ceramics exhibit a relatively high temperature of order–disorder phase transition in their magnetic subsystem. For applications related to the magnetization process of superconductors, however, a low value of Tc is required. Here we report and analyze in de...
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Thaljaoui, R., Pękała, M., Fagnard, J.-F., & Vanderbemden, P. (2016). Critical analysis of the paramagnetic to ferromagnetic phase transition in Pr0.55K0.05Sr0.4MnO3. Physica B. Condensed Matter, 482, 8 - 13. doi:10.1016/j.physb.2015.11.025
The critical properties of monovalent doped manganite Pr0.55K0.05Sr0.4MnO3 around the paramagnetic to ferromagnetic phase transition were investigated through various methods: the modified Arrott plots (MAP), the Kouvel-Fisher method and the critical isotherm analysis. Data obtained near Tc were ...
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Vanderbemden, P., Cardwell, D. A., Freyhardt, H. C., & Vanderheyden, B. (2016). Processing and applications of (RE)BCO and MgB2 bulk superconductors: an introduction to the special issue. Superconductor Science and Technology, 29, 060302. doi:10.1088/0953-2048/29/6/060302
Preface of the Superconductor Science and Technology special issue "Focus on processing and applications of (RE)BCO and MgB2 bulk superconductors". This special issue focuses on contributions from the 9th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain...
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Wera, L., Fagnard, J.-F., Hogan, K., Vanderheyden, B., & Vanderbemden, P. (2016). Magnetic Shielding with Bulk High Temperature Superconductors: Improvement of the Shielded Volume in Hollow Cylinders. In M. Muralidhar (Ed.), Superconductivity: Applications Today and Tomorrow (pp. 95-114). New York, United States - New York: Nova Science.
The superconducting HTS hollow cylinder has been one of the first geometries to demonstrate its utility as an efficient passive magnetic shield, and particularly for DC magnetic shielding. The shielding performances can be characterized by two parameters: (i) the shielding factor SF, defined as t...
Peer reviewed
Vanderbemden, P. (15 December 2015). Electric charging of bodies and electrostatic discharges: Basic notions [Paper presentation]. Journée d'études "Phénomènes électrostatiques" Centexbel 2015, Grace-Hollogne, Belgium.
Vanderbemden, P. (26 November 2015). Non-destructive measurements of the volume magnetic properties of large bulk (RE)BCO superconductors and hybrid ferromagnet/superconductor structures [Paper presentation]. One-day conference “Superconductivity in the Greater Region”, Saarbrucken, Germany.
Vanderbemden, P. (01 October 2015). Overview of magnetism activities at the Measurements and Instrumentation laboratory of the University of Liege [Paper presentation]. One-day conference on Magnetism in the Greater Region, Nancy, France.
Hogan, K., Wera, L., Fagnard, J.-F., Vanderheyden, B., & Vanderbemden, P. (09 September 2015). Magnetic shielding properties of a bulk Bi-2223 superconducting hollow cylinder subjected to the magnetic stray field of a nearby magnetic source [Poster presentation]. EUropean Conference on Applied Superconductivity EUCAS 2015, Lyon, France.
Superconducting materials act as efficient magnetic shields thanks to their intrinsic magnetic properties. At low frequencies, their efficiency even surpasses that of conventional ferromagnetic materials. Therefore, they can be very useful for many applications which require low or very low magne...
Wera, L., Fagnard, J.-F., Hogan, K., Vanderheyden, B., & Vanderbemden, P. (09 September 2015). Characterization of the magnetic properties of a continuously coated YBCO coated conductor cylinder in persistent current mode [Poster presentation]. EUropean Conference on Applied Superconductivity EUCAS 2015, Lyon, France.
YBCO coated conductors are good candidates for magnetic shielding applications because of (i) their high current density and (ii) their lower weight compared to magnetic shields made of bulk HTS materials. In particular, an efficient superconducting magnetic shield can be built as an assembly of ...
Wera, L., Fagnard, J.-F., Hogan, K., Vanderheyden, B., & Vanderbemden, P. (09 September 2015). Design of the superconducting end caps of a tubular magnetic shield [Poster presentation]. EUropean Conference on Applied Superconductivity EUCAS 2015.
Shielding a sensitive device against DC or AC stray magnetic fields can be realized very efficiently with high-Tc superconductors. A simple magnetic shield can be obtained with a tube enclosing the device, which is protected against external fields until the magnetic flux diffuses either across t...
Hogan, K., Fagnard, J.-F., Wera, L., Vanderheyden, B., & Vanderbemden, P. (04 September 2015). Magnetic shielding properties of tubular bulk superconductors subjected to stray magnetic fields [Paper presentation]. 9th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials (PASREG 2015), Liège, Belgium.
Superconducting materials act as efficient magnetic shields thanks to their intrinsic magnetic properties. The vast majority of studies on superconducting shields has been conducted in homogeneous magnetic field configurations. Only few works have been done concerning inhomogeneous magnetic field...
Peer reviewed
Fagnard, J.-F., Debois, S., Morita, M., Nariki, S., teshima, H., Vanderheyden, B., & Vanderbemden, P. (September 2015). Crossed field effect measured on a GdBCO pellet at various temperatures below 77 K [Paper presentation]. EUropean Conference on Applied Superconductivity EUCAS 2015, Lyon, France.
In engineering applications, superconducting bulk materials might be subjected to cycles of variable magnetic fields transverse to their trapped field which can cause a significant demagnetization. Up to now, several studies have been carried out on bulk superconducting pellets in order to charac...
Peer reviewed
Philippe, M., Ainslie, M. D., Fagnard, J.-F., Wera, L., Dennis, A., Shi, Y., Cardwell, D. A., Morita, M., Nariki, S., Teshima, H., Vanderheyden, B., & Vanderbemden, P. (September 2015). Influence of soft ferromagnetic materials on the magnetic flux density above large grain, bulk high temperature (RE)BCO superconductors: measurements and modelling [Poster presentation]. EUCAS 2015: 12th European Conference on Applied Superconductivity, Lyon, France.
Due to their ability to trap high magnetic fields, bulk (RE)BCO superconductors can be used as powerful permanent magnets in various engineering applications such as rotating machines and magnetic bearings. We combine soft ferromagnetic pieces with bulk, large grain (RE)BCO high temperature super...
Philippe, M., Ainslie, M. D., Fagnard, J.-F., Wera, L., Dennis, A., Shi, Y., Cardwell, D. A., Morita, M., Nariki, S., Teshima, H., Vanderheyden, B., & Vanderbemden, P. (September 2015). Trapped magnetic flux density and influence of crossed fields in structures combining large grain, bulk (RE)BCO superconductors and soft ferromagnetic discs [Paper presentation]. PASREG 2015: 9th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials, Liège, Belgium.
Bulk (RE)BCO superconductors are able to trap record magnetic fields and can be used as powerful permanent magnets in various engineering applications such as rotating machines and magnetic bearings. We combine soft ferromagnetic pieces with bulk, large grain (RE)BCO high temperature superconduct...
Peer reviewed
Philippe, M., Ainslie, M. D., Wera, L., Fagnard, J.-F., Dennis, A., Shi, Y., Cardwell, D. A., Vanderheyden, B., & Vanderbemden, P. (July 2015). Influence of soft ferromagnetic sections on the magnetic flux density profile of a large grain, bulk Y-Ba-Cu-O superconductor. Superconductor Science and Technology, 28, 095008. doi:10.1088/0953-2048/28/9/095008
Bulk, high temperature superconductors have significant potential for use as powerful permanent magnets in a variety of practical applications due to their ability to trap record magnetic fields. In this paper, soft ferromagnetic sections are combined with a bulk, large grain Y-Ba-Cu-O (YBCO) hig...
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Wera, L., Fagnard, J.-F., Levin, G., Vanderheyden, B., & Vanderbemden, P. (June 2015). A comparative study of triaxial and uniaxial magnetic shields made out of YBCO coated conductors. Superconductor Science and Technology, 28, 074001. doi:10.1088/0953-2048/28/7/074001
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Fagnard, J.-F., Kirsch, S., Morita, M., Teshima, H., Vanderheyden, B., & Vanderbemden, P. (15 May 2015). Measurements on magnetized GdBCO pellets subjected to small transverse ac magnetic fields at very low frequency: Evidence for a slowdown of the magnetization decay. Physica C. Superconductivity, 512, 42-53. doi:10.1016/j.physc.2015.03.005
Due to their ability to trap large magnetic inductions, superconducting bulk materials can be used as powerful permanent magnets. The permanent magnetization of such materials, however, can be significantly affected by the application of several cycles of a transverse variable magnetic field. In ...
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Pękała, M., Pękała, K., Drozd, V., Fagnard, J.-F., & Vanderbemden, P. (25 April 2015). Effect of nanocrystalline structure on magnetocaloric effect in manganite composites (1/3)La0.7Ca0.3MnO3/(2/3)La0.8Sr0.2MnO3. Journal of Alloys and Compounds, 629, 98-104. doi:10.1016/j.jallcom.2014.12.216
Poly- and nanocrystalline manganite composites (1/3)La0.7Ca0.3MnO3 and / (2/3)La0.8Sr0.2MnO3 prepared by the sol-gel method are studied by magnetic and transport measurements. The Arrott plots and universal curve of magnetic entropy change confirm that magnetic transition is of the second order. ...
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Egan, R., Philippe, M., Wera, L., Fagnard, J.-F., Vanderheyden, B., Dennis, A., Shi, Y., Cardwell, D. A., & Vanderbemden, P. (13 February 2015). A flux extraction device to measure the magnetic moment of large samples; application to bulk superconductors. Review of Scientific Instruments, 86 (2), 025107. doi:10.1063/1.4907903
We report the design and construction of a flux extraction device to measure the DC magnetic moment of large samples (i.e., several cm3) at cryogenic temperature. The signal is constructed by integrating the electromotive force generated by two coils wound in series-opposition that move around th...
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Hogan, K., Fagnard, J.-F., Wera, L., Vanderheyden, B., & Vanderbemden, P. (02 February 2015). Magnetic shielding of an inhomogenous magnetic field source by a bulk superconducting tube. Superconductor Science and Technology, 28 (3), 035011. doi:10.1088/0953-2048/28/3/035011
Bulk type-II irreversible superconductors can act as excellent passive magnetic shields, with a strong attenuation of low frequency magnetic fields. Up to now, the performances of superconducting magnetic shields have mainly been studied in a homogenous magnetic field, considering only immunity p...
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Claassen, J., Osofsky, M., Namburi, D., & Vanderbemden, P. (2015). Thin film superconducting shields. IEEE Transactions on Applied Superconductivity, 25 (3), 7500204. doi:10.1109/TASC.2014.2360134
To date, magnetic shields utilizing high-temperature superconductor materials mostly comprise bulk materials, usually shaped into a cylinder and then heat treated. We analyze the potential of thin-film technology, whereby a layer of superconductor is deposited on a substrate, to fabricate magneti...
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Devendra Kumar, N., Closset, R., Wera, L., Cloots, R., Vanderbemden, P., & Vertruyen, B. (2015). Magnetic shielding performances of YBa2Cu3O7−δ -coated silver tubes obtained by electrophoretic deposition. Superconductor Science and Technology, 28, 015007. doi:10.1088/0953-2048/28/1/015007
We report a complete procedure to achieve multilayer YBCO thick films by electrophoretic deposition on silver tubes using a suspension of YBCO powder in butanol. With the aim to optimize the magnetic shielding performances of the coatings, we have carried out an extensive investigation of the inf...
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Zou, J., Ainslie, M. D., Fujishiro, H., Bhagurkar, A. G., Naito, T., Babu, N. H., Fagnard, J.-F., Vanderbemden, P., & Yamamoto, A. (2015). Numerical modelling and comparison of MgB 2 bulks fabricated by HIP and infiltration growth. Superconductor Science and Technology, 28 (7), 075009. doi:10.1088/0953-2048/28/7/075009
MgB 2 in bulk form shows great promise as trapped field magnets (TFMs) as an alternative to bulk (RE)BCO materials to replace permanent magnets in applications such as rotating machines, magnetic bearings and magnetic separation, and the relative ease of fabrication of MgB 2 materials has enabled...
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Hogan, K., Wera, L., Fagnard, J.-F., Vanderheyden, B., & Vanderbemden, P. (12 August 2014). Magnetic shielding properties of a bulk Bi-2223 superconducting hollow cylinder subjected to an inhomogeneous magnetic field [Poster presentation]. Applied Superconductivity Conference ASC 2014, Charlotte, NC, United States.
Bulk superconducting materials are well suited for magnetic shielding applications. At low frequencies, the performances of superconductors are higher than those of conventional ferromagnetic materials. In shielding applications, two situations may be encountered. The first one corresponds to the...
Wera, L., Fagnard, J.-F., Hogan, K., Vanderheyden, B., & Vanderbemden, P. (12 August 2014). Experimental study of the magnetic shielding performances of a Bi2223 tube closed by a Bi2223 cap [Poster presentation]. Applied Superconductivity Conference ASC 2014, Charlotte, NC, United States.
A superconducting tube can be used as an efficient magnetic shield. However, the shielding factor (defined as the ratio between the applied magnetic induction and the magnetic induction measured inside the tube) decreases towards tube extremities because of the field penetration through the open ...
Fagnard, J.-F., Kirsch, S., Teshima, H., Morita, M., Vanderheyden, B., & Vanderbemden, P. (August 2014). Experimental study of GdBCO pellets subjected to small transverse alternating magnetic fields at very low frequency: Evidence of saturation of the axial magnetization decay [Poster presentation]. Applied Superconductivity Conference ASC 2014, Charlotte, NC, United States.
Due to their ability to trap large magnetic inductions, bulk (RE)BCO materials (where RE stands for rare-earth ion) can be used as powerful permanent magnets. Previous works have shown that the magnetization of a bulk superconductor can be destroyed by the presence of an ac magnetic field applied...
Kirsch, S., Fagnard, J.-F., Dubois, C., Caps, H., Vanderbemden, P., & Vanderheyden, B. (August 2014). Simulation of the convective cooling of a bulk superconductor by a coupling electromagnetic-fluid model [Poster presentation]. ASC 2014 - Applied Superconductivity Conference, Charlotte, N C, United States.
Philippe, M., Ainslie, M. D., Fagnard, J.-F., Wera, L., Dennis, A., Shi, Y., Cardwell, D. A., Vanderheyden, B., & Vanderbemden, P. (August 2014). Magnetic flux distribution and hysteresis properties of bulk high temperature ferromagnet / superconductor / ferromagnet hybrid structures [Poster presentation]. ASC 2014 : Applied Superconductivity Conference, Charlotte, United States - North Carolina.
Bulk (RE)BCO materials can be used potentially as powerful permanent magnets in various engineering applications such as rotating machines and magnetic bearings where their large flux density / volume ratio makes them more efficient than traditional ferromagnetic permanent magnets. However, the m...
Philippe, M., Fagnard, J.-F., Kirsch, S., Xu, Z., Dennis, A., Shi, Y., Cardwell, D. A., Vanderheyden, B., & Vanderbemden, P. (July 2014). Magnetic characterisation of large grain, bulk Y–Ba–Cu–O superconductor–soft ferromagnetic alloy hybrid structures. Physica C. Superconductivity, 502, 20-30. doi:10.1016/j.physc.2014.04.025
Large grain, bulk Y–Ba–Cu–O (YBCO) high temperature superconductors (HTS) have significant potential for use in a variety of practical applications that incorporate powerful quasi-permanent magnets. In the present work, we investigate how the trapped field of such magnets can be improved by combi...
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Boutaayamou, M., Lemaire, P., Vanderheyden, B., & Vanderbemden, P. (06 June 2014). Design and fabrication of an electrode array sensor for probing the electric potential distribution at the mesoscopic scale in antistatic felts. Measurement Science and Technology, 25, 075903 (9. doi:10.1088/0957-0233/25/7/075903
We present an original voltage probe design for measuring the electric potential distribution at the mesoscopic scale (i.e., 1 mm–1 cm) in antistatic felts. The felts are composed of a mixture of non-conductive and metallic fibers and exhibit complex nonlinear electric behavior—including possibly...
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Kirsch, S., Fagnard, J.-F., Dubois, C., Caps, H., Vanderbemden, P., & Vanderheyden, B. (13 May 2014). Coupled electromagnetic-fluid modelling of a bulk superconductor cooled by a cryogenic fluid [Paper presentation]. HTS Modelling 2014 - 4th International workshop on numerical modelling of high-temperature superconductors, Bratislava, Slovakia.
The electric and magnetic performance of a superconductor are strongly dependent of its temperature. For that reason, the cooling of the superconductor material is an important matter, especially for bulk superconductors, which favor low heat transfers because of their low thermal conductivity an...
Vanderbemden, P., Hogan, K., Wera, L., Vanderheyden, B., & Fagnard, J.-F. (28 April 2014). Magnetic screening with bulk high-temperature superconducting hollow tubes in the “emission” configuration [Paper presentation]. 4th International Conference on Superconductivity and Magnetism (ICSM2014 ), Antalya, Turkey.
Due to their unique ability to trap magnetic fields exceeding the saturation limit of conventional ferromagnetic materials, bulk superconductors can be used successfully in motors and generators. In several topologies however, the stray magnetic field produced by the superconducting magnet or coi...
Peer reviewed
Closset, R., Kumar, D., Wera, L., Dellicour, A., Henrist, C., Boschini, F., Cloots, R., Vanderbemden, P., & Vertruyen, B. (2014). YBa2Cu3O7-δ thick films for magnetic shielding: Electrophoretic deposition from butanol-based suspension. Materials Letters, 119, 154-156. doi:10.1016/j.matlet.2013.10.060
Multilayered YBa2Cu3O7-δ (YBCO) thick films were coated on silver substrates by electrophoretic deposition (EPD) followed by heat treatment. A butanol-based YBCO suspension is used instead of the common acetone-iodine combination. Tests with several dispersing agents reveal that a branched polyet...
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Thaljaoui, R., Boujelben, W., Pękała, M., Pękała, K., Antonowicz, J., Fagnard, J.-F., Vanderbemden, P., Dąbrowska, S., & Mucha, J. (2014). Structural, magnetic and magneto-transport properties of monovalent doped manganite Pr0.55K0.05Sr0.4MnO3. Journal of Alloys and Compounds, 611 (0), 427 - 432. doi:10.1016/j.jallcom.2014.05.114
Pr0.55K0.05Sr0.4MnO3 sample have been synthesized using the conventional solid state reaction. Rietveld refinements of the X-ray diffraction patterns at room temperature confirm that the sample is single phase and crystallizes in the orthorhombic structure with Pnma space group; the crystallite s...
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Thaljaoui, R., Boujelben, W., Pękała, M., Pękała, K., Fagnard, J.-F., Vanderbemden, P., Donten, M., & Cheikhrouhou, A. (2014). Magnetocaloric effect of monovalent K doped manganites Pr0.6Sr0.4−xKxMnO3 (x=0 to 0.2). Journal of Magnetism and Magnetic Materials, 352 (0), 6 - 12. doi:10.1016/j.jmmm.2013.09.057
Magnetic and magnetocaloric properties are reported for polycrystalline monovalent potassium doped manganites Pr0.6Sr0.4−xKxMnO3 (x=0, 0.05, 0.1, 0.15 and 0.2) crystallized in orthorhombic structure with Pnma space group. The increasing K content shifts the paramagnetic to ferromagnetic transitio...
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Vanderbemden, P., Molenberg, I., Simeonova, P., & Lovchinov, V. (2014). Some features of bulk melt-textured high-temperature superconductors subjected to alternating magnetic fields. Journal of Physics. Conference Series, 558, 012016. doi:10.1088/1742-6596/558/1/012016
Monolithic, large grain, (RE)Ba2Cu3O7 high-temperature superconductors (where RE denotes a rare-earth ion) are known to be able to trap fields in excess of several teslas and represent thus an extremely promising competing technology for permanent magnet in several applications, e.g. in motors an...
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Philippe, M., Fagnard, J.-F., Wera, L., Dennis, A., Shi, Y., Cardwell, D. A., Vanderheyden, B., & Vanderbemden, P. (07 November 2013). Measurement of the magnetic hysteresis cycle of bulk superconductor / ferromagnet hybrids [Paper presentation]. 2013 BEMEKO workshop on measurement : Challenges and Opportunities, Liège, Belgium.
Large grain, bulk YBa2Cu3O7-δ (YBCO) high temperature superconductors (HTS) can be potentially used as powerful permanent magnets for magnetic levitation. The magnetic flux distribution above a bulk HTS magnet, however, is strongly non-uniform compared to the rather flat distribution above a ferr...
Kirsch, S., Fagnard, J.-F., Vanderbemden, P., & Vanderheyden, B. (30 September 2013). Semi-analytical study of AC losses in an infinitely long superconducting cylinder surrounded by a metallic sheath: magnetic field dependent critical current density and generation of harmonics. Superconductor Science and Technology, 26, 115001. doi:10.1088/0953-2048/26/11/115001
We study the AC losses in an infinitely long cylinder made of a superconducting core surrounded by a non-magnetic metallic sheath and subjected to an axial magnetic field. The losses are computed by assuming the Bean–Kim model for the superconductor and Ohmic dissipation for the metal. The time v...
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Wera, L., Fagnard, J.-F., Levin, G. A., Vanderheyden, B., & Vanderbemden, P. (16 September 2013). Characterization of structures with a complex disposition of YBCO coated conductors for magnetic shielding applications [Poster presentation]. EUropean Conference on Applied Superconductivity EUCAS 2013, Genoa, Italy.
An efficient superconducting magnetic shield can be built as an assembly of YBCO 2G coated conductor sections. Each section is milled and placed around a cylindrical support in order to form a joint free superconducting loop where persistent currents can flow and provide a strong attenuation of ...
Fagnard, J.-F., Kirsch, S., Teshima, H., Morita, M., Vanderheyden, B., & Vanderbemden, P. (September 2013). Decay of the axial magnetization of GdBCO pellets subjected to small transverse alternating magnetic fields [Poster presentation]. EUropean Conference on Applied Superconductivity EUCAS 2013, Genoa, Italy.
Bulk (RE)BCO materials (where RE denotes a rare-earth ion) are known to be used as strong permanent magnets in various engineering devices, such as magnetic bearings or rotating machines. In so doing, the bulk pellet is usually magnetized along its c-axis and a permanent magnetic moment is trappe...
Kirsch, S., Fagnard, J.-F., Vanderbemden, P., & Vanderheyden, B. (September 2013). Numerical modelling of the magneto-thermal effects of a transverse AC magnetic field on the axial magnetization of a bulk superconducting cylinder [Poster presentation]. EUCAS 2013 - European Conference on Applied Superconductivity, Genoa, Italy.
We study the decrease of the magnetization of a bulk superconducting sample when it is subjected to a perpendicular AC magnetic field (crossed field" configuration). The effect of a transverse AC magnetic field on the permanent magnetization of the supercon- ductor are twofold: (i) the supercondu...
Philippe, M., Fagnard, J.-F., Wera, L., Dennis, A., Shi, Y., Cardwell, D. A., Vanderheyden, B., & Vanderbemden, P. (September 2013). Magnetic hysteresis cycle and remnant field distribution of bulk high temperature superconductor / ferromagnet hybrids [Poster presentation]. EUCAS 2013: European Conference on Applied Superconductivity, Genova, Italy.
Bulk (RE)BCO materials can be used potentially as powerful permanent magnets. The magnetic flux distribution above a bulk HTS magnet, however, is strongly non-uniform (conic profile predicted by the Bean model) compared to the rather flat distribution above a ferromagnet. In the present work, we ...
Namburi, D. K., Closset, R., Fagnard, J.-F., Vanderbemden, P., Vertruyen, B., & Cloots, R. (30 January 2013). YBCO superconducting thick films: electrophoretic deposition (EPD) on non-planar silver substrates [Paper presentation]. SHAPING 5, 5th International conference on Shaping of Advanced Ceramics, Mons, Belgium.
A new formulation of a stable YBa2Cu3O7-δ (YBCO) suspension is proposed in which butanol is preferred to the commonly-used acetone as the suspension medium. Appropriate surfactant has been used to develop the superficial charge on the YBCO particles in order to promote migration during the proces...
Laurent, P., Fagnard, J.-F., & Vanderbemden, P. (2013). AC Magnetic Measurements on Superconductors: Design of a Device for Magneto-Thermal Measurements. In A. Lay Ekuakille, Advanced Instrument Engineering: Measurement, Calibration, and Design (pp. 208-222). IGI Global. doi:10.4018/978-1-4666-4165-5.ch016
This work describes the design and realisation of an apparatus to measure simultaneously the AC magnetic properties and the temperature distribution on the top surface of bulk superconducting samples (up to 32 mm in diameter) in cryogenic conditions (temperature range 78-120 K). First we describe...
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Marchal, C., Fagnard, J.-F., Shi, Y. H., Cardwell, D. A., Mucha, J., Misiorek, H., Cloots, R., Vertruyen, B., & Vanderbemden, P. (2013). The influence of a grain boundary on the thermal transport properties of bulk, melt-processed Y-Ba-Cu-O. Superconductor Science and Technology, 26, 015006. doi:10.1088/0953-2048/26/1/015006
We report the dependence of thermal conductivity, thermoelectric power and electrical resistivity on temperature for a bulk, large grain melt-processed Y-Ba-Cu-O (YBCO) high temperature superconductor (HTS) containing two grains separated by a well-defined grain boundary. Transport measurements a...
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Pękała, M., Wolff-Fabris, F., Fagnard, J.-F., Vanderbemden, P., Mucha, J., Gospodinov, M. M., Lovchinov, V., & Ausloos, M. (2013). Magnetic properties and anisotropy of orthorhombic DyMnO3 single crystal. Journal of Magnetism and Magnetic Materials, 335 (0), 46 - 52. doi:10.1016/j.jmmm.2013.01.036
An orthorhombic DyMnO3 single crystal has been studied in magnetic fields up to 14 T and between 3 K and room temperature. The field dependent ordering temperature of Dy moments is deduced. The paramagnetic Curie Weiss behavior is related mainly to the Dy3+sublattice whereas the Mn sublattice con...
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Thaljaoui, R., Pękała, K., Pękała, M., Boujelben, W., Szydłowska, J., Fagnard, J.-F., Vanderbemden, P., & Cheikhrouhou, A. (2013). Magnetic susceptibility and electron magnetic resonance study of monovalent potassium doped manganites Pr0.6Sr0.4−xKxMnO3. Journal of Alloys and Compounds, 580 (0), 137 - 142. doi:10.1016/j.jallcom.2013.05.001
The monovalent potassium doped manganites Pr0.6Sr0.4−xKxMnO3 (x = 0.05–0.2) are characterized using the complementary magnetic susceptibility and electron resonance methods. In paramagnetic phase the temperature variations of the inverse magnetic susceptibility and the inverse intensity of resona...
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Wera, L., Fagnard, J.-F., Levin, G. A., Vanderheyden, B., & Vanderbemden, P. (20 December 2012). Magnetic shielding with YBCO coated conductors: influence of the geometry on its performances. IEEE Transactions on Applied Superconductivity, 23 (3), 8200504. doi:10.1109/TASC.2012.2235514
A superconducting magnetic shield can be built as a stack of several sections of milled 2G coated conductors. Each section consists of a closed loop where persistent currents can flow and provide a strong attenuation of external dc magnetic fields. The purpose of the present work is to study expe...
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Namburi, D. K., Closset, R., Fagnard, J.-F., Vertruyen, B., Cloots, R., & Vanderbemden, P. (07 December 2012). YBa2Cu3O7-x thick films on silver tubes for magnetic shielding applications [Paper presentation]. 8th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials (PASREG 2012), Tainan, Taiwan.
YBa2Cu3O7-x (YBCO) thick films are investigated for magnetic shielding applications at low frequencies (< 1 kHz). This requires deposition of YBCO on curved substrates such as tubes, half-tubes or even more complex shapes. Electrophoretic Deposition (EPD) is an efficient method to achieve this go...
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Vanderbemden, P., Dennis, T., Shi, Y. H., Cardwell, D. A., Kirsch, S., Vanderheyden, B., Philippe, M., & Fagnard, J.-F. (07 December 2012). Non-destructive measurement of volume magnetic properties of large, bulk superconductors [Paper presentation]. The 8th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials (PASREG 2012), Tainan, Taiwan.
The development of large, single grain bulk superconductors by melt processing techniques has generated a need to characterize samples magnetically over large dimensions, exceeding typically 20 mm in diameter. The usual magnetic characterization gives relies on miniature Hall probe mapping and gi...
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Wera, L., Fagnard, J.-F., Levin, G., Vanderheyden, B., & Vanderbemden, P. (10 October 2012). Magnetic shielding with YBCO coated conductors: influence of the geometry on its performances [Poster presentation]. Applied Superconductivity Conference ASC2012, Portland, OR, United States.
A superconducting magnetic screen can be built as a stack of several sections of milled 2G coated conductors. Each section consists of a closed loop where persistent currents can flow and provide a strong attenuation of external dc magnetic fields. The purpose of the present work is to study expe...
Fagnard, J.-F., Philippe, M., Vanderheyden, B., & Vanderbemden, P. (October 2012). Non-destructive characterization of DC volume magnetic properties of large, bulk (RE)BCO superconducting samples [Poster presentation]. Applied Superconductivity Conference ASC2012, Portland, OR, United States.
The development of large, single grain bulk superconductors by melt processing techniques has generated a need to characterize samples magnetically over large dimensions, exceeding typically 20 mm in diameter. The usual magnetic characterization gives relies on miniature Hall probe mapping and gi...
Kirsch, S., Fagnard, J.-F., Vanderbemden, P., & Vanderheyden, B. (October 2012). AC and heat losses in a superconductor cylinder surrounded by a metallic sheath [Poster presentation]. ASC 2012 - Applied Superconductivity Conference, Portland, United States.
In this work, we study numerically the magneto-thermal properties of a composite cylinder made of a superconducting core surrounded by a metallic sheath and subjected to an axial AC magnetic field . The metal is ohmic and non-magnetic while the superconductor is characterized by an E(J) power law...
Philippe, M., Fagnard, J.-F., Dennis, A., Shi, Y., Cardwell, D. A., Vanderheyden, B., & Vanderbemden, P. (October 2012). Magnetic behaviour of soft ferromagnetic alloys attached to bulk (RE)BCO superconductors [Poster presentation]. ASC 2012 : Applied Superconductivity Conference, Portland, United States - Oregon.
Bulk (RE)BCO materials can be used potentially as powerful permanent magnets. The magnetic field distribution around a bulk HTS magnet, however, is strongly non-uniform (conic profile predicted by the Bean model) compared to the rather flatter distribution around a ferromagnet. In the present wor...
Vanderbemden, P. (12 June 2012). Magnetic and electrical characterization of superconductors [Paper presentation]. ESAS summer school 2012, Lans en Vercors, France.
Vanderbemden, P. (15 May 2012). Low level measurement for superconductors [Paper presentation]. World Metrology Day 2012, Brussels, Belgium.
Vanderbemden, P., Elschner, S., Hobl, A., Bock, J., Vanderheyden, B., & Fagnard, J.-F. (11 April 2012). Magnetic shielding properties of a cut superconducting hollow cylinder : modelling and experiment [Paper presentation]. HTS Modelling 2012 : III International workshop on modelling of high temperature superconductors, Barcelona, Spain.
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Kirsch, S., Fagnard, J.-F., Vanderbemden, P., & Vanderheyden, B. (April 2012). AC losses of an infinitely long superconductor cylinder surrounded by a metallic sheath [Poster presentation]. Third International Workshop on Numerical Modelling of High Temperature Superconductors, Barcelona, Spain.
We study the AC losses in a structure composed of an infinitely long superconducting cylinder surrounded by a metallic sheath. The system is subjected to an axial alternating magnetic flux. The AC losses are evaluated locally in each material and compared to the situation where no metallic sheath...
Bhame, S., Fagnard, J.-F., Pekala, M., Vanderbemden, P., & Vertruyen, B. (2012). La0.7Ca0.3MnO3 / Mn3O4 composites: does an insulating secondary phase always enhance the low field magnetoresistance of manganites? Journal of Applied Physics, 111, 063905. doi:10.1063/1.3694664
Composites of magnetoresistive La0.7Ca0.3MnO3 (LCMO) with insulating Mn3O4 are useful as a model system because no foreign cation is introduced in the LCMO phase by interdiffusion during the heat treatment. Here we report the magnetotransport properties as a function of sintering temperature Tsin...
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Fagnard, J.-F., Elschner, S., Hobl, A., Bock, J., Vanderheyden, B., & Vanderbemden, P. (2012). Magnetic shielding properties of a superconducting hollow cylinder containing slits: Modelling and experiment. Superconductor Science and Technology, 25 (10), 104006. doi:10.1088/0953-2048/25/10/104006
This paper deals with the magnetic properties of bulk high temperature superconducting cylinders used as magnetic shields. We investigate, both numerically and experimentally, the magnetic properties of a hollow cylinder with two axial slits which cut the cylinder in equal halves. Finite element ...
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Fagnard, J.-F., Vanderheyden, B., & Vanderbemden, P. (2012). Magnetic Shielding with Bulk High Temperature Superconductors: Factors Influencing the Magnetic Field Penetration in Hollow Cylinders. In M. Muralidhar (Ed.), Superconductivity: Recent Developments and New Production Technologies. Nova.
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Pekala, M., Pekala, K., Drozd, V., Staszkiewicz, K., Fagnard, J.-F., & Vanderbemden, P. (2012). Magnetocaloric and transport study of poly- and nanocrystalline composite manganites La0.7Ca0.3MnO3/La0.8Sr0.2MnO3. Journal of Applied Physics, 112, 023906. doi:10.1063/1.4739262
Magnetocaloric and transport properties are reported for novel poly- and nanocrystalline double composite manganites, La0.8Sr0.2MnO3/La0.7Ca0.3MnO3, prepared by the sol-gel method. Magnetic field dependence of magnetic entropy change is found to be stronger for the nano- than the polycrystalline ...
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Starbov, N., Starbova, K., Vanderbemden, P., Simeonova, P., & Lovchinov, V. (2012). An experimental approach for synthesis of Fe-Al-O multiferroic fibrous material. Journal of Physics. Conference Series, 398, 012050. doi:10.1088/1742-6596/398/1/012050
Basic principles of the electro-hydrodynamics are applied for synthesis of solid state Fe-Al-O multi-ferroic fibrous material. For that purpose stable blend spinning solutions comprised of a high molecular assisting organic polymer and salts of iron and aluminum are developed. These solutions are...
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Vanderbemden, P., & Lovchinov, V. (2012). Influence of the shielding currents lengthscale and anisotropy effects on the magnetic flux profiles of high-temperature superconductors. Journal of Physics. Conference Series, 398, 012012. doi:10.1088/1742-6596/398/1/012012
The so-called "magnetic flux profile" AC inductive technique is a powerful method for determining the critical current density Jc of bulk superconductors. In this work we aim at reporting analytical expressions for magnetic flux profiles of superconducting rectangular samples exhibiting a critica...
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Vanderschueren, H., & Vanderbemden, P. (2012). Résultats de mesure de l'exhalation de radon dans la grotte de Ramioul (Belgique). ULg.
Boutaayamou, M., Léonard, A., Vanderheyden, B., & Vanderbemden, P. (2011). Study of Conduction Mechanisms in Antistatic Felts at the Mesoscopic Scale. In International Symposium on New Frontiers in Fiber Materials Science; Conference Proceedings.
This work is part of a project that deals with the optimization of the quantity and the nature of conductive fibers in antistatic felts used for filtering and sieving powders. Our research concerns the electrical properties at the mesoscopic scale. It aims at determining the conduction mechanisms...
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Fagnard, J.-F., Dirickx, M., Elschner, S., Hobl, A., Vanderheyden, B., & Vanderbemden, P. (September 2011). Magnetic shielding properties of a superconducting hollow cylinder: Influence of a vertical or a horizontal slit [Poster presentation]. EUCAS 2011 - European Conference on Applied Superconductivity.
The magnetic shielding properties under both axial and transverse DC magnetic fields are measured at the liquid nitrogen temperature (77 K) on Bi-2212 hollow cylinders obtained by Melt Cast Process. The characterized samples are cut by a slit along either a vertical (parallel to the cylinder axis...
Fagnard, J.-F., Dirickx, M., Vanderbemden, P., & Vanderheyden, B. (September 2011). Magnetic behaviour of a superconducting hollow cylinder subjected to crossed fields: Experimental and modelling results [Poster presentation]. EUCAS 2011 - European Conference on Applied Superconductivity.
Experiments are carried out to study the decay of the axial magnetization of a hollow cylinder subjected to a transverse magnetic field varying with a low frequency (a “crossed-fields” configuration). The measured sample is a Bi-2223 cylinder immersed in a bath of liquid nitrogen (T = 77 K). The ...
Lousberg, G., Fagnard, J.-F., Chaud, X., Ausloos, M., Vanderbemden, P., & Vanderheyden, B. (2011). Magnetic properties of drilled bulk high-temperature superconductors filled with a ferromagnetic powder. Superconductor Science and Technology, 24, 035008. doi:10.1088/0953-2048/24/3/035008
It is shown that filling the holes of a drilled bulk high-temperature superconductor (HTS) with a soft ferromagnetic powder enhances its trapping properties. The magnetic properties of the trapped field magnet are characterized by Hall probe mapping and magnetization measurements. This analysis i...
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Muguerra, H., Rivas-Murias, B., Traianidis, M., Marchal, C., Vanderbemden, P., Vertruyen, B., Henrist, C., & Cloots, R. (2011). Thermoelectric properties of n-type Ca1-xDyxMn1-yNbyO3-delta compounds (x=0, 0.02, 0.1 and y=0, 0.02) prepared by spray-drying method. Journal of Alloys and Compounds, 509 (29), 7710-7716. doi:10.1016/j.jallcom.2011.04.056
We report the high temperature thermoelectric properties of Ca1-xDyxMn1-yNbyO3-delta (x = 0, 0.02, 0.1 and y = 0, 0.02) synthesized by spray-drying method. A maximum power factor (PF) value of 2.65 mu WK-2 cm(-1) is obtained at 1100 K for CaMn0.98Nb0.02O3-delta. This represents an improvement of ...
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Rivas-Murias, B., Fagnard, J.-F., Vanderbemden, P., Traianidis, M., Henrist, C., Cloots, R., & Vertruyen, B. (2011). Spray drying: An alternative synthesis method for polycationic oxide compounds. Journal of Physics and Chemistry of Solids, 72 (3), 158-163. doi:10.1016/j.jpcs.2010.12.001
Synthesis of polycationic compounds by the spray-drying technique is an interesting alternative in the domain of aqueous precursor synthesis methods. Spray drying yields high quality samples with good reproducibility. The possibility of scaling up for production of large quantities with fast proc...
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Turczynski, S., Orlinski, K., Pawlak, D. A., Diduszko, R., Mucha, J., Pekala, M., Fagnard, J.-F., Vanderbemden, P., & Carpenter, M. A. (2011). Czochralski crystal growth, thermal conductivity, and magnetic properties of Pr(x)La(1- x)AlO3, where x = 1, 0.75, 0.55, 0.40, 0. Crystal Growth and Design, 11 (4), 1091-1097. doi:10.1021/cg101273y
Crystals of Pr(x)La(1-x)AlO3 solid solution have been grown by the Czochralski method for the first time, to the best of our knowledge. Crystals with high praseodymium concentration tend to grow spirally. The color of the crystals changes with chemical composition. X-ray diffraction shows an incr...
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Vanderbemden, P. (November 2010). Closing address for the session "Bullks and Characterization" [Paper presentation]. 23rd International Symposium on Superconductivity 2010 (ISS2010), Tsukuba, Japan.
Vanderbemden, P., Fagnard, J.-F., Babu, N. H., Cardwell, D. A., & Vanderheyden, B. (November 2010). Bulk melt-processed (RE)BCO superconductors subjected to AC fields in “parallel” and “crossed” direction, experiment and modelling [Paper presentation]. 23rd International Symposium on Superconductivity 2010 (ISS2010), Tsukuba, Japan.
When bulk melt-processed (RE)BCO samples are used as permanent magnets in various engineering applications (e.g. rotating machines, magnetic bearings), they may experience transient or periodic variations of the applied magnetic field. In such a situation, the remnant magnetization of the sample ...
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Fagnard, J.-F., Dirickx, M., Vanderheyden, B., Vanderbemden, P., Barnes, P. N., & Levin, G. (August 2010). Screening of axial DC magnetic fields by using superconducting loops of second generation coated conductors without joints [Poster presentation]. Applied Superconductivity Conference ASC2010, Washington DC, United States.
The performances of second generation (2G) YBCO coated conductors for screening DC magnetic fields at 77 K are investigated experimentally. An uninterrupted superconducting path is achieved by splitting two sections of a slit 2G tape in order to obtain a loop without joint. Several loops are stac...
Lousberg, G., Fagnard, J.-F., Ausloos, M., Vanderbemden, P., & Vanderheyden, B. (August 2010). Improving the performance of trapped field magnets made of drilled bulk high-temperature superconductors by filling the holes with a soft ferromagnetic material [Paper presentation]. PASREG 2010 - The 7th international workshop on processing and applications of superconducting (RE)BCO large grain materials, Washington DC, United States.
The field trapped in a drilled bulk high-temperature superconductor (HTS) is shown to be enhanced when the holes are filled with a powder of a soft ferromagnetic material. Characterizations based on Hall probe mapping and magnetization measurements are used and show an increase of the trapped mag...
Fagnard, J.-F., Dirickx, M., Elschner, S., Bock, J., Vanderheyden, B., & Vanderbemden, P. (July 2010). Study of the magnetic shielding ability in relation with the non linear E(J) relationship of melt cast Bi-2212 tubes under DC axial magnetic fields [Poster presentation]. PASREG 2010 - The 7th international workshop on processing and applications of superconducting (RE)BCO large grain materials, Washington DC, United States.
In this work, we aim at describing as widely as possible the shielding properties and the E(J) relationship of Bi-2212 tubes from non-destructive measurements on a whole cylinder. First, the threshold magnetic induction below which the shielding occurs, Blim, is measured in a large temperature ra...
Fagnard, J.-F., Elschner, S., Bock, J., Dirickx, M., Vanderheyden, B., & Vanderbemden, P. (July 2010). Study of the magnetic shielding ability in relation with the non linear E(J) relationship of melt cast Bi-2212 tubes under DC axial magnetic fields [Paper presentation]. PASREG 2010 - The 7th international workshop on processing and applications of superconducting (RE)BCO large grain materials, Washington DC, United States.
In this work, we aim at describing as widely as possible the shielding properties and the E(J) relationship of Bi-2212 tubes from non-destructive measurements on a whole cylinder. First, the threshold magnetic induction below which the shielding occurs, Blim, is measured in a large temperature ra...
Vanderheyden, B., Lousberg, G., Ausloos, M., Vanderbemden, P., Dular, P., & Geuzaine, C. (07 May 2010). Modeling high-temperature superconductors containing an array of holes [Paper presentation]. International workshop on numerical modelling of High Temperature Superconductors, EPFL 2010, Lausanne, Switzerland.
We have recently implemented a finite-element model for the penetration of the magnetic flux inside a bulk superconductor containing an array of holes (thin-wall superconductor), with the help of the open-source code GetDp. In this talk, I introduce the A-phi formulation used, with edge elements ...
Fagnard, J.-F., Dirickx, M., Levin, G. A., Barnes, P. N., Vanderheyden, B., & Vanderbemden, P. (2010). Use of second generation coated conductors for efficient shielding of DC magnetic fields. Journal of Applied Physics, 108, 013910. doi:10.1063/1.3459895
This paper reports the results of an experimental investigation of the performance of two types of magnetic screens assembled from YBa2Cu3O7-d (YBCO) coated conductors. Since effective screening of the axial DC magnetic field requires the unimpeded flow of an azimuthal persistent current, we demo...
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Fagnard, J.-F., Elschner, S., Bock, J., Dirickx, M., Vanderheyden, B., & Vanderbemden, P. (2010). Shielding efficiency and E(J) characteristics measured on large melt cast Bi-2212 hollow cylinders in axial magnetic fields. Superconductor Science and Technology, 23, 095012. doi:10.1088/0953-2048/23/9/095012
We show that tubes of melt cast Bi-2212 used as current leads for LTS magnets can also act as efficient magnetic shields. The magnetic screening properties under an axial DC magnetic field are characterized at several temperatures below the liquid nitrogen temperature (77 K). Two main shielding p...
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Laurent, P., Fagnard, J.-F., Hari Babu, N., Cardwell, D. A., Vanderheyden, B., & Vanderbemden, P. (2010). Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field. Superconductor Science and Technology, 23, 124004. doi:10.1088/0953-2048/23/12/124004
In this work we study, both experimentally and numerically, the self-heating of a bulk, large YBCO pellet of aspect ratio (thickness / diameter) ~ 0.4 subjected to a large AC magnetic field. To ensure accurate temperature measurements, the sample was placed in an experimental vacuum chamber to ac...
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Lousberg, G., Fagnard, J.-F., Ausloos, M., Vanderbemden, P., & Vanderheyden, B. (2010). Drilled bulk high-temperature superconductors: enhancing the trapped magnetic flux by filling the holes with a ferromagnetic powder [Poster presentation]. ASC 2010 - Applied Superconductivity Conference, Washington DC, United States.
Filling the holes of a drilled bulk high-temperature superconductor (HTS) with a ferromagnetic powder is shown to enhance its trapping properties. We use experimental techniques (Hall probe mapping techniques and magnetization measurements) to characterize the magnetic properties of drilled sampl...
Lousberg, G. P., Fagnard, J.-F., Ausloos, M., Vanderbemden, P., & Vanderheyden, B. (2010). Modification of the trapped field in bulk HTS as a result of the drilling of a pattern of artificial holes. Journal of Physics. Conference Series, 234, 012023. doi:10.1088/1742-6596/234/1/012023
The trapped magnetic field is examined in bulk high-temperature superconductors that are artificially drilled along their c-axis. The influence of the hole pattern on the magnetization is studied and compared by means of numerical models and Hall probe mapping techniques. To this aim, we consider...
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Lousberg, G., Fagnard, J.-F., Ausloos, M., Vanderbemden, P., & Vanderheyden, B. (January 2010). Numerical Study of the Shielding properties of Macroscopic Hybrid Ferromagnetic/Superconductor Hollow Cylinders. IEEE Transactions on Applied Superconductivity, 20 (1), 33. doi:10.1109/TASC.2009.2036855
We study the magnetic shielding properties of hybrid ferromagnetic/superconductor (F/S) structures consisting of two coaxial cylinders, with one of each material.We use an axisymmetric finite-element model in which the electrical properties of the superconducting tube are modeled by a nonlinear E...
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Pekala, M., Drozd, V., Fagnard, J.-F., & Vanderbemden, P. (2010). Magnetocaloric effect in nano- and polycrystalline manganites La0.5Ca0.5MnO3. Journal of Alloys and Compounds, 507, 350-355. doi:10.1016/j.jallcom.2010.07.165
Structure, magnetic and magnetocaloric properties of poly- and nanocrystalline La0.5Ca0.5MnO3 manganites prepared by the citrate sol–gel method are studied in a broad temperature range. The Arrott plots show that the phase transition is of the second order. The cooling efficiency of 93–97 J/kg is...
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Pekala, M., Pekala, K., Drozd, V., Fagnard, J.-F., & Vanderbemden, P. (2010). Magnetocaloric effect in La0.75Sr0.25MnO3 manganite. Journal of Magnetism and Magnetic Materials, 322 (21), 3460-3463. doi:10.1016/j.jmmm.2010.06.045
The polycrystalline manganite La0.75Sr0.25MnO3 prepared by an alternative carbonate precipitation route reveals the rhombohedral perovskite structure. Magnetization isotherms measured up to 2 T are used to determine Curie temperature of 332 K by means of Arrott plot. Maximum of magnetic entropy c...
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Pietnoczka, A., Pekala, M., Bacewicz, R., Drozd, V., Fagnard, J.-F., Vanderbemden, P., Antonowicz, J., & Zalewski, W. (2010). Local Structure of Mn in (La1-xHox)2/3Ca1/3MnO3 Studied by X-ray Absorption Fine Structure. Acta Physica Polonica A, 117 (2), 257-261. doi:10.12693/APhysPolA.117.281
Results of X-ray absorption fine structure measurements in manganites (La1-xHox)2/3Ca1/3MnO3 with 0.15 < x < 0.50 are presented. When LaMnO3 is doped with a divalent element such as Ca2+, substituting forLa3+, holes are induced in the filled Mn d orbitals. This leads to a strong ferromagnetic cou...
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Vanderbemden, P., Laurent, P., Fagnard, J.-F., Ausloos, M., Hari Babu, N., & Cardwell, D. A. (2010). Magneto-thermal phenomena in bulk high temperature superconductors subjected to applied AC magnetic fields. Superconductor Science and Technology, 23, 075006. doi:10.1088/0953-2048/23/7/075006
In the present work we study, both theoretically and experimentally, the temperature increase in a bulk high temperature superconductor subjected to applied AC magnetic fields of large amplitude. We calculate analytically the equilibrium temperatures of the bulk sample as a function of the experi...
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Vanderbemden, P., Rivas-Murias, B., Lovchinov, V., & Vertruyen, B. (2010). Measurement of dielectric properties at low temperatures: application to the study of magnetoresistive manganite/ insulating oxide bulk composites. Journal of Physics. Conference Series, 253, 012006. doi:10.1088/1742-6596/253/1/012006
In this paper, we report low temperature dielectric measurements of bulk composite electroceramic samples containing a colossal magnetoresistive (CMR) manganite phase (La0.7Ca0.3MnO3 [abbreviated LCMO]) and an insulating phase (Mn3O4). Details of the experimental system are given and possible exp...
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Lousberg, G., Fagnard, J.-F., Haanappel, E., Chaud, X., Ausloos, M., Vanderheyden, B., & Vanderbemden, P. (2009). Pulsed-field magnetization of drilled bulk high-temperature superconductors: flux front propagation in the volume and on the surface. Superconductor Science and Technology, (22), 125026. doi:10.1088/0953-2048/22/12/125026
We present a method for characterizing the propagation of the magnetic flux in an artificially drilled bulk high-temperature superconductor (HTS) during pulsed-field magnetization. As the magnetic pulse penetrates the cylindrical sample, the magnetic flux density is measured simultaneously in 16 ...
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Fagnard, J.-F., Dirickx, M., Ausloos, M., Lousberg, G., Vanderheyden, B., & Vanderbemden, P. (October 2009). Magnetic shielding properties of high- Tc superconducting hollow cylinders: model combining experimental data for axial and transverse magnetic field configurations. Superconductor Science and Technology, 22 (10), 105002 (10. doi:10.1088/0953-2048/22/10/105002
Magnetic shielding efficiency was measured on high- Tc superconducting hollow cylinders subjected to either an axial or a transverse magnetic field in a large range of field sweep rates, dBapp/dt. The behaviour of the superconductor was modelled in order to reproduce the main features of the fiel...
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Fagnard, J.-F., Dirickx, M., Ausloos, M., Vanderheyden, B., & Vanderbemden, P. (September 2009). Temperature dependence of HTS magnetic shielding properties: Measurements on Pb-doped Bi-2223 hollow cylinders submitted to axial magnetic fields [Poster presentation]. EUCAS 2009 - 9th European Conference on Applied Superconductivity, Dresden, Germany.
Measurements of the magnetic shielding properties of Pb-doped Bi-2223 hollow cylinders submitted to an axial magnetic field have been carried out at several temperatures in the range 10 K - 95 K. The amplitude of the internal magnetic field was probed using a high sensitivity 3-axis Hall sensor. ...
Fagnard, J.-F., Denis, S., Lousberg, G., Dirickx, M., Ausloos, M., Vanderheyden, B., & Vanderbemden, P. (June 2009). DC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes. IEEE Transactions on Applied Superconductivity, 19 (3), 2905-2908. doi:10.1109/TASC.2009.2017880
We have studied numerically and experimentally the magnetic flux penetration in high-Tc superconducting tube subjected to a uniform magnetic field parallel to its long axis. This study is carried in view of designing low-frequency magnetic shields by exploiting the diamagnetic properties of high-...
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Lousberg, G., Ausloos, M., Geuzaine, C., Dular, P., Vanderbemden, P., & Vanderheyden, B. (May 2009). Numerical simulation of the magnetization of high-temperature superconductors: a 3D finite element method using a single time-step iteration. Superconductor Science and Technology, 22, 055005. doi:10.1088/0953-2048/22/5/055005
In this paper, we report progress towards a 3D finite element model for the magnetization of a high-temperature superconductor (HTS): we suggest a method that takes into account a power law conductivity and demagnetization effects, while neglecting the effects associated with currents that are no...
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Lousberg, G., Fagnard, J.-F., Noudem, J. G., Ausloos, M., Vanderheyden, B., & Vanderbemden, P. (March 2009). Measurement of the magnetic field inside the holes of a drilled bulk high-Tc superconductor. Superconductor Science and Technology, 22, 045009. doi:10.1088/0953-2048/22/4/045009
We use macroscopic holes drilled in a bulk YBCO superconductor to probe its magnetic properties in the volume of the sample. The sample is subjected to an AC magnetic flux with a density ranging from 30 to 130 mT and the flux in the superconductor is probed by miniature coils inserted in the hole...
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Lay-Ekuakille, A., Vendramin, G., Trotta, A., & Vanderbemden, P. (2009). STFT-based spectral analysis of urban waterworks leakage detection. In XIX IMEKO World Congress Proceedings (pp. 2172-2176).
Water is an essential good for human being necessity. It must be protected against pollution and useless leakage. Urban waterworks is a strategic infrastructure to be managed with particular attention and care so that users must be satisfied. Different techniques are used to detect leaks from wat...
Peer reviewed
Mucha, J., Vertruyen, B., Misiorek, H., Ausloos, M., Durczewski, K., & Vanderbemden, P. (2009). Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites. Journal of Applied Physics, 105 (6), 063501. doi:10.1063/1.3078796
We report the temperature dependence of the thermal conductivity kappa(T) of bulk polycrystalline composite samples containing a magnetoresistive manganite (La0.7Ca0.3MnO3) and an electrically insulating phase (Mn3O4). The sample porosity is shown to be a significant parameter affecting the exper...
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Pekala, M., Drozd, V., Fagnard, J.-F., Vanderbemden, P., & Ausloos, M. (2009). Magneto transport characterization of the Sn-doped TbMnO3 manganites. Journal of Alloys and Compounds, 467 (1-2), 35 - 40. doi:10.1016/j.jallcom.2007.11.143
The structural, magnetic and electrical transport properties of the Sn-doped TbMnO3 manganites are studied by X-ray diffraction, ac susceptibility, dc magnetization and electrical resistivity measurements. The Sn doping into the Tb and Mn sites of TbMnO3 compresses the unit cell and changes param...
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Pekala, M., Drozd, V., Fagnard, J.-F., Vanderbemden, P., & Ausloos, M. (2009). Magnetotransport of La0.5Ba0.5MnO3. Journal of Applied Physics, 105 (1), 013923-013923-8. doi:10.1063/1.3032326
Physical properties of polycrystalline La0.5Ba0.5MnO3 are reported from low temperature (10 K) up to above room temperature. An aim has been to obtain microscopic parameters and to search for the characteristic lengths in terms of which one can discuss the interplay between magnetic, electric, an...
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Radulov, I., Lovchinov, V., Dimitrov, D., Simeonova, P., & Vanderbemden, P. (2009). Magnetic and transport properties of HoMnO3 monocrystals. Journal of Optoelectronics and Advanced Materials, 11, 1553-1556.
This paper presents results from measurements of the magnetization, specific heat and dielectric constant, and their temperature and magnetic field dependence, for HoMnO3 single crystals. The results are discussed in the framework of existing data on magnetic symmetries and the interactions betwe...
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Vanderbemden, P., Vertruyen, B., Ausloos, M., Rivas-Murias, B., & Lovchinov, V. (2009). Grain boundary effects in bulk colossal magneto resistive (CMR) manganites and manganite/insulator composites: electrical and magnetic properties. Journal of Optoelectronics and Advanced Materials, 11 (9), 1115-1121.
In the first part of this paper, we discuss the effects of grain boundaries on the properties of bulk colossal magnetoresistive (CMR) manganites We compare the electrical resistivity and AC magnetic susceptibility of perovskite La-Ca-Mn-O samples with the same nominal stoichiometry but differing ...
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Fagnard, J.-F., Denis, S., Lousberg, G., Ausloos, M., Vanderheyden, B., & Vanderbemden, P. (August 2008). DC and AC shielding properties of bulk high-Tc superconducting tubes [Poster presentation]. Applied Superconductivity Conference ASC2008.
In this work we have studied numerically and experimentally the magnetic flux penetration in high-Tc superconducting tube subjected to a uniform magnetic field parallel to its long axis. This study is carried in view of designing low-frequency magnetic shields by exploiting the diamagnetic proper...
Lousberg, G., Regnier, J.-H., Ausloos, M., Vanderbemden, P., & Vanderheyden, B. (August 2008). Measurement and modeling of macroscopic ferromagnetic/high-Tc superconductor hybrid structures: applications to drilled bulk HTS with ferromagnetic materials inserted inside the holes [Poster presentation]. ASC 2008 - Applied Superconductivity Conference, Chicago, United States.
Hybrid ferromagnetic/high-Tc superconductors (F/S) structures are realized by inserting iron cylinders inside the macroscopic columnar holes of drilled bulk high-Tc superconductors. The ferromagnetic material, with its tendency to concentrate the magnetic flux lines, modifies the magnetic propert...
Lousberg, G., Ausloos, M., Vanderbemden, P., & Vanderheyden, B. (February 2008). Bulk high-Tc superconductors with drilled holes: how to arrange the holes to maximize the trapped magnetic flux? Superconductor Science and Technology, 21, 025010. doi:10.1088/0953-2048/21/02/025010
Drilling holes in a bulk high-Tc superconductor enhances the oxygen annealing and the heat exchange with the cooling liquid. However, drilling holes also reduces the amount of magnetic flux that can be trapped in the sample. In this paper, we use the Bean model to study the magnetization and the ...
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Pekala, M., Drozd, V., Fagnard, J.-F., Vanderbemden, P., & Ausloos, M. (February 2008). Magnetocaloric effect in nano- and polycrystalline manganite La0.7Ca0.3MnO3. Applied Physics. A, Materials Science and Processing, 90 (2), 237-241. doi:10.1007/s00339-007-4309-x
La0.7Ca0.3MnO3 samples were prepared in nano- and polycrystalline forms by the sol-gel and solid state reaction methods, respectively, and structurally characterized by synchrotron X-ray diffraction. The magnetic properties determined by ac susceptibility and dc magnetization measurements are dis...
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Hong, Z., Vanderbemden, P., Pei, R., Jiang, Y., Campbell, A. M., & Coombs, T. A. (2008). The Numerical Modeling and Measurement of Demagnetization Effect in Bulk YBCO Superconductors Subjected to Transverse Field. IEEE Transactions on Applied Superconductivity, 18 (2), 1561-1564. doi:10.1109/TASC.2008.920594
In this paper, the crossed field demagnetization effect of the bulk type-II superconducting materials in a variety of external magnetic field condition has been investigated both numerically and experimentally. A melt-textured YBCO bulk sample was magnetized along the axial direction and after th...
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Laurent, P., Fagnard, J.-F., Vanderheyden, B., Hari Babu, N., Cardwell, D. A., Ausloos, M., & Vanderbemden, P. (2008). An ac susceptometer for the characterization of large, bulk superconducting samples. Measurement Science and Technology, 19 (8), 085705. doi:10.1088/0957-0233/19/8/085705
The main purpose of this work was to design, develop and construct a simple, low-cost ac susceptometer to measure large, bulk superconducting samples (up to 32 mm in diameter) in the temperature range 78–120 K. The design incorporates a double heating system that enables a high heating rate (25 K...
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Vanderbemden, P. (01 October 2007). Advances in magnetic materials for magnetic sensors [Paper presentation]. Research seminar, Dept of Innovation Engineering Faculty of Engineering, University of Salento, Lecce, Italy.
Magnetic materials are used in various engineering applications, including magnetic sensors. In particular, magnetoresistors (i.e. magnetic field dependent resistors) become increasingly popular. This talk will review the different materials used for magnetoresistors, their performances and appli...
Vanderbemden, P., Hong, Z., Coombs, T. A., Ausloos, M., Babu, N. H., Cardwell, D. A., & Campbell, A. M. (September 2007). Remagnetization of bulk high-temperature superconductors subjected to crossed and rotating magnetic fields. Superconductor Science and Technology, 20 (9 Sp. Iss. SI), 174-S183. doi:10.1088/0953-2048/20/9/S10
Bulk melt-processed Y-Ba-Cu-O (YBCO) has significant potential for a variety of high-field permanent-magnet-like applications, such as the rotor of a brushless motor. When used in rotating devices of this kind, however, the YBCO can be subjected to both transient and alternating magnetic fields t...
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Vertruyen, B., Cloots, R., Ausloos, M., Fagnard, J.-F., & Vanderbemden, P. (August 2007). Unusual resistivity hysteresis in a bulk magnetoresistive ferromagnetic/ferrimagnetic composite (La0.7Ca0.3MnO3/Mn3O4): Role of demagnetization effects. Applied Physics Letters, 91 (6), 062514. doi:10.1063/1.2768883
The authors report an intriguing resistivity versus magnetic field dependence in polycrystalline composite samples containing a magnetoresistive manganite (ferromagnetic/conducting La0.7Ca0.3MnO3) and a magnetic manganese oxide (ferrimagnetic/insulating Mn3O4). At 10 K, when the magnetic field is...
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Laurent, P., Vanderbemden, P., Meslin, S., Noudem, J. G., Mathieu, J.-P., Cloots, R., & Ausloos, M. (June 2007). Measurements of thermal effects in a bulk YBCO single domain superconductor submitted to a variable magnetic field. IEEE Transactions on Applied Superconductivity, 17 (2, Part 3), 3036-3039. doi:10.1109/TASC.2007.898988
When YBCO single domains are subjected to a variable magnetic field, the motion of vortices may give rise to a significant temperature increase and a degradation of the superconducting properties. We have experimentally investigated such effects in bulk melt-processed YBCO single domains. Several...
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Fabris, F. W., Pekala, M., Drozd, V., Fagnard, J.-F., Vanderbemden, P., Liu, R. S., & Ausloos, M. (May 2007). Magnetocaloric effect and magnetic properties of Tb0.9Sn0.1MnO3. Journal of Applied Physics, 101 (10), 103904. doi:10.1063/1.2732453
The magnetocaloric effect in magnetic materials is of great interest nowadays. In this article we present an investigation about the magnetic properties near the magnetic transition in a polycrystalline sample of a manganite Tb0.9Sn0.1MnO3. Particularly, we are interested in describing the nature...
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Denis, S., Dirickx, M., Vanderbemden, P., Ausloos, M., & Vanderheyden, B. (2007). Field penetration into hard type-II superconducting tubes: effects of a cap, a non-superconducting joint, and non-uniform superconducting properties. Superconductor Science and Technology, 20 (5), 418-427. doi:10.1088/0953-2048/20/5/002
Using the numerical method of Brandt (1998 Phys. Rev. B 58 6506), we study the penetration of a uniform magnetic field that is gradually applied parallel to the axis of finite type-II superconducting tubular samples with strong pinning. This study is carried out in view of designing low-frequency...
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Denis, S., Dusoulier, L., Dirickx, M., Vanderbemden, P., Cloots, R., Ausloos, M., & Vanderheyden, B. (2007). Magnetic shielding properties of high-temperature superconducting tubes subjected to axial fields. Superconductor Science and Technology, 20 (3), 192-201. doi:10.1088/0953-2048/20/3/014
We have experimentally studied the magnetic shielding properties of a cylindrical shell of BiPbSrCaCuO subjected to low frequency AC axial magnetic fields. The magnetic response has been investigated as a function of the dimensions of the tube, the magnitude of the applied field and the frequency...
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Dusoulier, L., Denis, S., Dirickx, M., Vanderbemden, P., Ausloos, M., Cloots, R., & Vertruyen, B. (2007). Influence of thermal treatment on YBa2Cu3O7-x thick films prepared by electrophoretic deposition on Ni and Ag substrates. Materials Research Society Symposia Proceedings, 1001E, 1001-M05-03. doi:10.1557/proc-1001-m05-03
We have studied the sintering parameters of YBa2Cu3O7-x (YBCO) coatings produced by electrophoretic deposition (EPD) on Ag and Ni substrates. The maximal sintering temperature is ~ 930°C due to partial melting and chemical contamination for Ag and Ni substrates respectively. Increasing the sinter...
Peer reviewed
Lovchinov, V., Apostolov, A., Dimitrov, D., Radulov, I., Simeonova, P., Kalaydjiev, K., & Vanderbemden, P. (2007). Magnetic and transport properties investigation of rare-earth compounds with orthorhombic structures. Journal of Optoelectronics and Advanced Materials, 9 (2), 460-463.
The structural, magnetic, magnetoelectric, and ferroelectric properties of a series of monocrystals with perovskite structures have been examined. The investigations were carried out in the temperature range 2-800 K and at magnetic fields up to 14 T. The existence of giant magnetoresistance (GMR)...
Peer reviewed
Vanderbemden, P., Hong, Z., Coombs, T. A., Denis, S., Ausloos, M., Schwartz, J., Rutel, I. B., Babu, N. H., Cardwell, D. A., & Campbell, A. M. (2007). Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model. Physical Review. B, Condensed Matter and Materials Physics, 75 (17), 174515. doi:10.1103/PhysRevB.75.174515
Crossed-magnetic-field effects on bulk high-temperature superconductors have been studied both experimentally and numerically. The sample geometry investigated involves finite-size effects along both (crossed-)magnetic-field directions. The experiments were carried out on bulk melt-processed Y-Ba...
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Vertruyen, B., Cloots, R., Ausloos, M., Fagnard, J.-F., & Vanderbemden, P. (2007). Electrical transport and percolation in magnetoresistive manganite/insulating oxide composites: Case of La0.7Ca0.3MnO3/Mn3O4. Physical Review. B, Condensed Matter and Materials Physics, 75 (16), 165112. doi:10.1103/PhysRevB.75.165112
We report the results of electrical resistivity measurements carried out on well-sintered La0.7Ca0.3MnO3/Mn3O4 composite samples with almost constant composition of the magnetoresistive manganite phase (La0.7Ca0.3MnO3). A percolation threshold (phi c) occurs when the La0.7Ca0.3MnO3 volume fractio...
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Vertruyen, B., Fagnard, J.-F., Vanderbemden, P., Ausloos, M., Rulmont, A., & Cloots, R. (2007). Electrical transport and magnetic properties of Mn3O4-La0.7Ca0.3MnO3 ceramic composites prepared by a one-step spray-drying technique. Journal of the European Ceramic Society, 27 (13-15), 3923-3926. doi:10.1016/j.jeurceramsoc.2007.02.061
La0.7Ca0.3MnO3/Mn3O4 composites can be synthesized in one step by thermal treatment of a spray-dried precursor, instead of mixing pre-synthesized powders. Another advantage of this composite system is that a long sintering step can be used without leading to significant modification of the mangan...
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Krins, N., Hatert, F., Traina, K., Dusoulier, L., Molenberg, I., Fagnard, J.-F., Vanderbemden, P., Rulmont, A., Cloots, R., & Vertruyen, B. (April 2006). LiMn2-xTixO4 spinel-type compounds (x <= 1): Structural, electrical and magnetic properties. Solid State Ionics, 177 (11-12), 1033-1040. doi:10.1016/j.ssi.2006.04.001
LiMn2-xTixO4 compounds with 0.5 =
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Denis, S., Grenci, G., Dusoulier, L., Cloots, R., Vanderbemden, P., Vanderheyden, B., Dirickx, M., & Ausloos, M. (2006). Characterisation of the magnetic shielding properties of YBaCuO thick films prepared by electrophoretic deposition on silver substrates. Journal of Physics. Conference Series, 43, 509-512. doi:10.1088/1742-6596/43/1/126
This communication reports experimental results on the superconducting properties of YBaCuO thick films prepared by electrophoretic deposition on silver substrates. The magnetic shielding properties of the coatings were characterised by various methods. First, the electrical resistance and the tr...
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Dusoulier, L., Denis, S., Fagnard, J.-F., Henrist, C., Vanderheyden, B., Vanderbemden, P., Rulmont, A., Dirickx, M., Ausloos, M., Cloots, R., & Vertruyen, B. (2006). YBa2Cu3O(7-delta) thick films on Ag prepared by the electrophoretic deposition technique. Journal of Physics. Conference Series, 43, 134-137. doi:10.1088/1742-6596/43/1/034
YBa2Cu3O7-δ thick films have been deposited onto Ag substrates by the Electrophoretic Deposition (EPD) technique. Different microstructures and electrical behaviours were observed depending on the starting powder. Coatings prepared from commercial powder displayed significant porosity and the sup...
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Dusoulier, L., Denis, S., Nutal, N., Henrist, C., Vanderheyden, B., Vanderbemden, P., Rulmont, A., Dirickx, M., Ausloos, M., Cloots, R., & Vertruyen, B. (2006). Texturation of YBa2Cu3O7-delta thick films by electrophoretic deposition under magnetic field. Key Engineering Materials, 314, 153-157. doi:10.4028/0-87849-998-9.153
YBa2Cu3O7-delta coatings were deposited by electrophoretic deposition (EPD) onto Ni substrates. Particles of different sizes and shapes were used in order to study the influence of the powder microstructure on the film density. Texturation of the thick films was induced by application of a magnet...
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Dusoulier, L., Denis, S., Vanderbemden, P., Dirickx, M., Ausloos, M., Cloots, R., & Vertruyen, B. (2006). Preparation of YBa2Cu3O7-x superconducting thick films by the electrophoretic deposition method. Journal of Materials Science, 41 (24), 8109-8114. doi:10.1007/s10853-006-0596-4
YBa2Cu3O7-x thick films have been realised by the Electrophoretic Deposition method (EPD). The influence of several parameters (powder and iodine concentrations in the suspension, applied voltage and deposition time) on the EPD process has been studied by measuring the conductivity of the suspens...
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Fagnard, J.-F., Crate, D., Jamoye, J.-F., Laurent, P., Mattivi, B., Cloots, R., Ausloos, M., Genon, A., & Vanderbemden, P. (2006). Use of a High-Temperature Superconducting Coil for Magnetic Energy Storage. Institute of Physics Conference Series, 43, 829-832. doi:10.1088/1742-6596/43/1/202
A high temperature superconducting magnetic energy storage device (SMES) has been realised using a 350 m-long BSCCO tape wound as a ''pancake'' coil. The coil is mounted on a cryocooler allowing temperatures down to 17.2 K to be achieved. The temperature dependence of coil electrical resistance R...
Peer reviewed
Laurent, P., Fagnard, J.-F., Mathieu, J.-P., Meslin, S., Noudem, J. G., Cloots, R., Ausloos, M., & Vanderbemden, P. (2006). Study of thermal effects in bulk RE-BCO superconductors submitted to a variable magnetic field. Journal of Physics. Conference Series, 43, 505-508. doi:10.1088/1742-6596/43/1/125
When bulk RE-BCO superconductors are used as permanent magnets in engineering applications, they are likely to experience transient variations of the applied magnetic field. The resulting vortex motion may cause a significant temperature increase. As a consequence the initial trapped flux is redu...
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Wu, B.-M., Li, B., Zhen, W.-H., Ausloos, M., Du, Y.-L., Fagnard, J.-F., & Vanderbemden, P. (May 2005). Spin-cluster effect and lattice-deformation-induced Kondo effect, spinglass freezing, and strong phonon scattering in La0.7Ca0.3Mn1-xCrxO3. Journal of Applied Physics, 97 (10, Part 1), 103908. doi:10.1063/1.1898438
Besides the Kondo effect observed in dilute magnetic alloys, the Cr-doped perovskite manganate compounds La0.7Ca0.3Mn1-xCrxO3 also exhibit Kondo effect and spin-glass freezing in a certain composition range. An extensive investigation for the La0.7Ca0.3Mn1-xCrO3 (x=0.01, 0.05, 0.10, 0.3, 0.6, and...
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Kalaydjiev, K., Lovchinov, V., Dimitrov, D., Kirov, M., Baychev, M., Popov, C., Radev, D. D., Marinov, M., Tumbalev, V., Radev, I., & Vanderbemden, P. (2005). Superconducting nanostructured magnesium diboride. Journal of Optoelectronics and Advanced Materials, 7 (1), 423-426.
Like conventional superconductors, MgB2 is a phonon-mediated superconductor with a relatively long coherence length. Its properties make the prospects for fabricating reproducible uniform Josephson junctions, the fundamental element of superconducting circuits, much more favorable for MgB2 than f...
Peer reviewed
Laurent, P., Mathieu, J.-P., Mattivi, B., Fagnard, J.-F., Meslin, S., Noudem, J. G., Ausloos, M., Cloots, R., & Vanderbemden, P. (2005). Study by Hall probe mapping of the trapped flux modification produced by local heating in YBCOHTS bulks for different surface/volume ratios. Superconductor Science and Technology, 18 (8), 1047-1053. doi:10.1088/0953-2048/18/8/004
The aim of this report is to compare the trapped field distribution under a local heating created at the sample edge for different sample morphologies. Hall probe mappings of the magnetic induction trapped in YBCO bulk samples maintained out of thermal equilibrium were performed on YBCO bulk sing...
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Mathieu, J.-P., Fagnard, J.-F., Laurent, P., Mattivi, B., Henrist, C., Vanderbemden, P., Ausloos, M., & Cloots, R. (2005). Silver paint as a soldering agent for DyBaCuO single-domain welding. Superconductor Science and Technology, 18 (4), 508-512. doi:10.1088/0953-2048/18/4/021
Silver paint has been tested as a soldering agent for DyBaCuO 4 single-domain welding. Junctions have been manufactured on Dy-Ba-Cu-O single domains cut either along planes parallel to the c-axis IT or along the ab-planes. Microstructural and superconducting characterizations of the samples have ...
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Mathieu, J.-P., Koutzarova, T., Rulmont, A., Fagnard, J.-F., Laurent, P., Mattivi, B., Vanderbemden, P., Ausloos, M., & Cloots, R. (2005). Investigation of DyBa2CU3O7-d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles. Superconductor Science and Technology, 18 (2 Sp. Iss. SI), 136-S141. doi:10.1088/0953-2048/18/2/028
An infiltration and growth process is here used as an alternative to the classical top-seeded melt-textured growth process for the production of Dy-123 single-domains with finely dispersed small size Dy-211 particles. The starting materials are the 211-particles and a barium and copper rich liqui...
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Pekala, M., Mucha, J., Vanderbemden, P., Cloots, R., & Ausloos, M. (2005). Magneto-transport characterization of Dy123 monodomain superconductors. Applied Physics. A, Materials Science and Processing, 81 (5), 1001-1007. doi:10.1007/s00339-004-3014-2
We consider textured materials of the DyBa2Cu3O7 type seeded with a Nd123 seed as initiator. They are grown with an excess 20% Dy211 phase on a Dy2O3 substrate. We report chemical characterization, electrical resistivity, thermoelectric power and thermal conductivity over a broad temperature rang...
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Wu, B. M., Ausloos, M., Du, Y. L., Zheng, W. H., Li, B., Fagnard, J.-F., & Vanderbemden, P. (2005). Spin glass behaviour and spin-dependent scattering in La0.7Ca0.3Mn0.9Cr0.1O3 perovskites. Chinese Physics Letters, 22 (3), 686-689. doi:10.1088/0256-307X/22/3/046
The magnetic, electrical and thermal transport properties of the perovskite La0.7Ca0.3Mn0.9Cr0.1O3 have been investigated by measuring dc magnetization, ac susceptibility, the magnetoresistance and thermal conductivity in the temperature range of 5-300 K. The spin glass behaviour with a spin free...
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Ausloos, M., Pekala, M., Latuch, J., Mucha, J., Vanderbemden, P., Vertruyen, B., & Cloots, R. (December 2004). Unusual thermoelectric behavior of packed crystalline granular metals. Journal of Applied Physics, 96 (12), 7338-7345. doi:10.1063/1.1808248
Loosely packed granular materials are intensively studied nowadays. Electrical and thermal transport properties should reflect the granular structure, as well as intrinsic properties. We have compacted crystalline CaAl-based metallic grains and studied the electrical resistivity and the thermoele...
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Vertruyen, B., Dusoulier, L., Fagnard, J.-F., Vanderbemden, P., Vanhoyland, G., Ausloos, M., Delwiche, J., Rulmont, A., & Cloots, R. (September 2004). Anisotropic behaviour in the magnetic field dependence of the low temperature electrical resistance of calcium-doped lanthanum manganate thin films grown by RF magnetron sputtering. Journal of Magnetism and Magnetic Materials, 280 (2-3), 264-272. doi:10.1016/j.jmmm.2004.03.022
We report about the magnetoresistive properties of calcium-doped lanthanum manganate thin films grown by RF magnetron sputtering on single crystalline LaAiO(3) and MgO substrates. Two orientations of the magnetic field with respect to the electrical current have been studied: (i) magnetic field i...
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Fagnard, J.-F., Rahier, S., Fonder, N., Marguillier, D., Cloots, R., Ausloos, M., & Vanderbemden, P. (2004). Superconducting properties of magnetically textured Dy doped Bi-2212 nickel tapes. In A. Andreone, Applied Superconductivity 2003 (Proceedings of the 6th European Conference on Applied Superconductivity) (pp. 1696-1703). Bristol, United Kingdom: Institute of Physics.
This communication aims at reporting the superconducting properties of Dy-doped Bi-2212/NiO/Ni tapes prepared by a dip-coating process from an inorganic gel. The Bi-2212 is recrystallized at 965°C in presence of an external 1.2 T magnetic induction. The precursor gel, the temperature and the ther...
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Mathieu, J.-P., Cano, I. G., Koutzarova, T., Rulmont, A., Vanderbemden, P., Dew-Hughes, D., Ausloos, M., & Cloots, R. (2004). The contribution of 211 particles to the mechanical reinforcement mechanism of 123 superconducting single domains. Superconductor Science and Technology, 17 (1), 169-174. doi:10.1088/0953-2048/17/1/030
Hardness and fracture toughness of Dy-123 single domains were studied by Vickers in micro-indentation. A significant anisotropy of the mechanical properties was observed. Hardness tests give higher values when performed in (001) planes rather than in planes parallel to the c-axis. Moreover, the c...
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Swartz, J. P., Mc Culloch, M. D., Pecher, R., Prigozhin, L., Vanderbemden, P., & Chapman, S. J. (2004). Critical state modelling of crossed field demagnetisation in HTS materials. In A. Andreone, G. P. Pepe, R. Cristiano, ... G. Masullo (Eds.), Applied Superconductivity 2003 (Proceedings of the 6th European Conference on Applied Superconductivity) (pp. 859-866). Bristol, United Kingdom: IOP.
Large magnetic fields can be trapped in high temperature superconductor material, enabling their use as permanent magnets in various applications. It has, however, been observed that these materials experience a decay in magnetisation when a field is applied in a direction transverse to the trapp...
Peer reviewed
Vertruyen, B., Rulmont, A., Cloots, R., Ausloos, M., Fagnard, J.-F., Dorbolo, S., & Vanderbemden, P. (January 2004). Effects of silicon addition on the electrical and magnetic properties of copper-doped (La,Ca)MnO3 compounds. Journal of Magnetism and Magnetic Materials, 268 (3), 364-373. doi:10.1016/S0304-8853(03)00548-1
In this paper we report about the electrical properties of La0.7Ca0.3MnO3 compounds substituted by copper on the manganese site and/or deliberately contaminated by SiO2 in the reactant mixture. Several phenomena have been observed and discussed. SiO2 addition leads to the formation of an apatite-...
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Vanderbemden, P., Vertruyen, B., Rulmont, A., Cloots, R., Dhalenne, G., & Ausloos, M. (December 2003). ac magnetic behavior of large-grain magnetoresistive La0.78Ca0.22Mn0.90Ox materials. Physical Review. B, Condensed Matter and Materials Physics, 68 (22), 224418. doi:10.1103/PhysRevB.68.224418
We report a detailed set of ac magnetic measurements carried out on bulk large grain La-Ca-Mn-O samples extracted from a floating zone method-grown rod. Three samples with La0.78Ca0.22Mn0.90Ox stoichiometry but differing in their microstructure were investigated by electrical resistivity and ac s...
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Fagnard, J.-F., Vanderbemden, P., Cloots, R., & Ausloos, M. (June 2003). Anisotropic AC behavior of multifilamentary Bi-2223/Ag tapes. IEEE Transactions on Applied Superconductivity, 13 (2, Part 3), 2976-2979. doi:10.1109/TASC.2003.812079
In this communication, we report on the anisotropy of the superconducting properties of multifilamentary Bi-based tapes experimentally investigated by AC magnetic susceptibility measurements. The susceptibility X = X' - jX" was measured using a commercial system and a couple of orthogonal pick-up...
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Vanderbemden, P., Dorbolo, S., Hari-Babu, N., Ntatsis, A., Cardwell, D. A., & Campbell, A. M. (June 2003). Behavior of bulk melt-textured YBCO single domains subjected to crossed magnetic fields. IEEE Transactions on Applied Superconductivity, 13 (2, Part 3), 3746-3749. doi:10.1109/TASC.2003.812538
We have experimentally investigated the crossed magnetic field effects on bulk melt-processed YBCO single domains. The samples were first permanently magnetized along their c-axis and then subjected to several cycles of a transverse magnetic field parallel to the ab planes. The magnetic propertie...
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Mucha, J., Pekala, M., Szydlowska, J., Gadomski, W., Akimitsu, J., Fagnard, J.-F., Vanderbemden, P., Cloots, R., & Ausloos, M. (2003). Magnetotransport study of MgB2 superconductor. Superconductor Science and Technology, 16 (10), 1167-1172. doi:10.1088/0953-2048/16/10/308
Precise magnetotransport studies of heat and charge carriers in polycrystalline MgB2 show that magnetic fields up to 8 T remarkably influence electrical resistivity, thermoelectric power and thermal conductivity. The superconducting transition temperature shifts from 39 K to 19 K at 8 T as observ...
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Pekala, M., Mucha, J., Cloots, R., Fagnard, J.-F., Vanderbemden, P., & Ausloos, M. (2003). Magneto-transport study of nb-doped Bi/Pb2223 superconductor. Physica C. Superconductivity, 387 (1-2), 191-197. doi:10.1016/S0921-4534(03)00668-3
The magneto-transport properties of Bi1.5Pb0.4Nb0.1Sr2Ca2Cu3O10-x polycrystalline, superconducting ceramic are reported. The material was found to be chemically homogeneous and partially textured. The mixed state properties were investigated by measuring the electrical resistivity, longitudinal a...
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Vertruyen, B., Rulmont, A., Cloots, R., Ausloos, M., Dorbolo, S., & Vanderbemden, P. (December 2002). Synthesis of CMR manganate compounds: the consequences of the choice of a precursor method. Materials Letters, 57 (3), 598-603. doi:10.1016/S0167-577X(02)00837-6
We have studied the electrical transport properties of manganate samples synthesized by different precursor methods. Differences in the synthesis process of the materials can result in samples with similar grain size but very different physical properties, contrary to what happens in samples prep...
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Fagnard, J.-F., Vanderbemden, P., Crate, D., Misson, V., Ausloos, M., & Cloots, R. (2002). Intragranular and intergranular behaviour of multifilamentary Bi-2223/Ag tapes. Physica C. Superconductivity, 372 (Part 2), 970-973. doi:10.1016/S0921-4534(02)00947-4
This communication aims at reporting the superconducting properties of Bi-2223/Ag tapes determined by using various measuring techniques. First. the original samples have been characterized by electrical resistance, AC susceptibility. and DC magnetization. The transport (intergranular) critical C...
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Marguillier, D., Cloots, R., Rulmont, A., Fagnard, J.-F., Vanderbemden, P., & Ausloos, M. (2002). YBa2Cu3O7 tapes prepared by sol-gel deposition techniques: microstructure and structural characterizations. Physica C. Superconductivity, 372 (Part 2), 715-718. doi:10.1016/S0921-4534(02)00889-4
We report on the preparation conditions of YBa2Cu3O7 polycrystalline superconducting tapes by a sol-gel deposition technique. We present some discussion on the compatibility between the nature of the substrate, the use of a buffer layer, and the conditions used to prepare appropriate superconduct...
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Vanderbemden, P., Misson, V., Ausloos, M., & Cloots, R. (2002). Magnetic and transport measurements on melt-textured DyBCO single domains. Physica C. Superconductivity, 372 (Part 2), 1225-1228. doi:10.1016/S0921-4534(02)00978-4
In this communication we report critical current measurements of melt processed DyBa2Cu3O7-x samples determined by several measuring techniques. First the material was characterized by AC susceptibility and DC magnetization. The results are characteristic of good quality melt-processed (RE)BCO ma...
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Vertruyen, B., Cloots, R., Rulmont, A., Dorbolo, S., Vanderbemden, P., & Ausloos, M. (2002). Cu doping as a tool for understanding CMR. Key Engineering Materials, 206-2, 1453-1456.
Doping at the Mn-site in CMR manganate-based perovskites has been shown to affect strongly the physical properties of those compounds. We study here the effect of copper substitution in the low doping range on the electrical transport properties of La0.7Ca0.3MnO3. It turns out that the transition...
Vanderbemden, P., Ausloos, M., & Cloots, R. (2001). Magnetic properties of melt-textured DyBCO single domains. Materials Research Society Symposia Proceedings, 659, 8.4.1-6.
This communication aims at reporting the superconducting properties of several bulk melt-processed DyBa2Cu3O7-x samples determined by using various measuring techniques. The original single domain material was first cut into 9 similar cubic samples which have been characterized by AC susceptibili...
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Vanderbemden, P., Bougrine, H., Ausloos, M., & Cloots, R. (2001). Magnetic properties of magnetically textured Bi-2212 ceramics. Physica C. Superconductivity, 351 (1), 67-70. doi:10.1016/S0921-4534(00)01694-4
This paper aims at reporting magnetic properties of bulk polycrystalline Bi2Sr2Ca0.8Dy0.2Cu2O8-y samples textured under a magnetic field. The microstructure of these materials is highly anisotropic and exhibits particular features needed to be taken into account in order to interpret their magnet...
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Vanderbemden, P., & Vertruyen, B. (2001). Matériaux manganates CMR… la voie vers une nouvelle génération de capteurs inductifs ? Bulletin Scientifique de l'Association des Ingénieurs Électriciens sortis de l'Institut Électrotechnique Montefiore, 4, 20-28.
Vertruyen, B., Cloots, R., Rulmont, A., Dhalenne, G., Ausloos, M., & Vanderbemden, P. (2001). Magnetotransport properties of a single grain boundary in a bulk La-Ca-Mn-O material. Journal of Applied Physics, 90 (11), 5692-5697. doi:10.1063/1.1410885
Besides the "intrinsic" colossal magnetoresistance effect observed in single crystals, the polycrystalline manganate compounds also exhibit an "extrinsic" magnetoresistance related to the presence of grain boundaries. We report electrical transport and magnetic measurements carried out on a bigra...
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Vertruyen, B., Rulmont, A., Dorbolo, S., Bougrine, H., Vanderbemden, P., Ausloos, M., & Cloots, R. (2000). Two peak effect in GMR : a chemical effect ? Materials Research Society Symposia Proceedings, 602, 269-274.
We show that the synthesis conditions have a dramatic influence on the resistivity behavior of calcium and sodium doped LaMnO3. Several samples prepared by lowtemperature techniques exhibit a double-peaked curve of resistance versus temperature. The model of spin-polarized intergranular tunneling...
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Vanderbemden, P. (1999). Determination of critical current in bulk high temperature superconductors by magnetic flux profile measuring methods [Doctoral thesis, ULiège - Université de Liège]. ORBi-University of Liège. https://orbi.uliege.be/handle/2268/23009
In this thesis, the emphasis is placed on determining the critical current density in bulk high-temperature superconductors by magnetic flux profile measuring methods. The thesis involves three different aspects : a brief theoretical investigation of the flux profile methods, the practical realiz...
Bradley, A. D., Doyle, R. A., Charalambous, D., Lo, W., Cardwell, D. A., Campbell, A. M., & Vanderbemden, P. (1999). Transport properties of bulk-bicrystal grain boundaries in artificially joined large-grain YBCO. IEEE Transactions on Applied Superconductivity, 9 (2), 2038-2041. doi:10.1109/77.784865
A technique for joining large-grain YBCO has been used to produce bulk-bicrystal grain boundaries of different orientations. The behaviour of boundaries nominally of 0 degrees[100], 0 degrees[001] and asymmetric 15 degrees[100]-tilt misorientation have been investigated using low frequency transp...
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Vanderbemden, P. (1999). La mesure du courant critique des matériaux supraconducteurs à haute température critique. Bulletin de l'Association des Ingénieurs sortis de l'Université de Liège, 6, 9-11.
Vanderbemden, P., Aouina, Z., Cloots, R., & Ausloos, M. (1999). A new fast and non-destructive method for evaluating the superconducting properties of bulk materials. In X. Obradors, F. Sandiumenge, ... J. Fontcuberta (Eds.), Applied Superconductivity 1999. Volume 1 : Large Scale Applications (pp. 203-206). IOP.
This paper aims at reporting a new, simple and low-cost experimental technique designed for investigating the electrical properties of disk-shaped superconducting samples. The principle is similar to that of an induction motor. Two neighbouring and 90° out-of-phase AC magnetic fields are applied ...
Peer reviewed
Vanderbemden, P., Cloots, R., Ausloos, M., Doyle, R. A., Bradley, A. D., Lo, W., Cardwell, D. A., & Campbell, A. M. (1999). Intragranular and intergranular superconducting properties of bulk melt-textured YBCO. IEEE Transactions on Applied Superconductivity, 9 (2), 2308-2311. doi:10.1109/77.784932
We have investigated the superconducting properties of bulk melt-processed YBCO using different experimental techniques. First, single domain materials (i.e. containing no grain boundaries) have been studied. Electrical resistivity, current-voltage characteristics, M-H loops, and A,C. susceptibil...
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Doyle, R. A., Bradley, A. D., Lo, W., Cardwell, D. A., Campbell, A. M., Vanderbemden, P., & Cloots, R. (1998). High field behavior of artificially engineered boundaries in melt-processed YBa2Cu3O7-delta. Applied Physics Letters, 73 (1), 117-119. doi:10.1063/1.121786
Artificial bulk "zero-angle" boundaries parallel to the c axis have been engineered between large melt-processed YBa2CU3O7-delta (YBCO) grains and observed to carry a transport supercurrent at fields up to at least 5 T at 77 K. The temperature and angular dependencies of the boundary resistance h...
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Vanderbemden, P. (1998). Design of an AC susceptometer based on a cryocooler. Cryogenics, 38 (8), 839-842. doi:10.1016/S0011-2275(98)00063-0
This paper describes a simple and low-cost experimental setup intended for low temperature measurements under a time-dependent magnetic field. A typical application of this system is the determination of A.C. susceptibility and flux profiles of high-T-c superconductors. The A.C. magnetic field is...
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Vanderbemden, P., Bougrine, H., Ausloos, M., Auguste, F., & Cloots, R. (1998). AC susceptibility data on Dy2O3 seeded randomly oriented Dy-123 mono domains melt-textured superconductor. Materials Science and Engineering: B, Solid-State Materials for Advanced Technology, 53 (1-2), 198-202. doi:10.1016/S0921-5107(97)00327-9
Dy-123 superconducting ceramics have been grows using small Dy2O3 single-crystals as seeds. Randomly oriented large mono-domains have been observed in the vicinity of the seeding single crystal. These domains are one order of magnitude greater in volume than the seed. The AC susceptibility versus...
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Vanderbemden, P., Bradley, A. D., Doyle, R. A., Lo, W., Astill, D. M., Cardwell, D. A., & Campbell, A. M. (1998). Superconducting properties of natural and artificial grain boundaries in bulk melt-textured YBCO. Physica C. Superconductivity, 302 (4), 257-270. doi:10.1016/S0921-4534(98)00238-X
A range of experimental techniques have been used to characterize melt-processed YBa2Cu3O7-d samples containing single-grain boundaries. Both natural high-angle boundaries, which sometimes appear during the grain growth process, and artificial low-angle boundaries, obtained by joining two single ...
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Vanderbemden, P., Destombes, C., Cloots, R., & Ausloos, M. (1998). Magnetic flux penetration and creep in BSSCO-2223 composite ceramics. Superconductor Science and Technology, 11 (1), 94-100. doi:10.1088/0953-2048/11/1/019
We have experimentally investigated the magnetic flux penetration through a Bi-2223 polycrystalline superconductor synthesized by a classical solid-state reaction method. Electrical resistance, AC susceptibility, the Campbell method and magnetic flux waveform recordings have been analysed and com...
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Vanderbemden, P. (1997). Propriétés des profils de flux d'induction magnétique dans les céramiques supraconductrices. Bulletin Scientifique de l'Association des Ingénieurs Électriciens sortis de l'Institut Électrotechnique Montefiore, 2, 20-29.
Cloots, R., Dang, A., Vanderbemden, P., Vanderschueren, A., Bougrine, H., Vanderschueren, H., Rulmont, A., & Ausloos, M. (1996). Field percolation and high current density in 80/20 DyBa2Cu3O7-x/Dy2BaCuO5 bulk magnetically textured composite ceramics. Zeitschrift für Physik. B, Condensed Matter, 100 (4), 551-555. doi:10.1007/s002570050160
We measured the AC susceptibility of magnetically textured (123) 80%/211(20%) DyBaCuO composite in a special set-up in order to enhance the intergrain contribution. The synthesis process led to very clean ''weak links'' at grain boundaries. At the percolation threshold bulk shielding paths were s...
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Lo, W., Dewhurst, C. D., Cardwell, D. A., Vanderbemden, P., Doyle, R. A., & Astill, D. M. (1996). Growth features and intergranular connectivity of melt processed YBCO. Applied Superconductivity, 4 (10-11), 507-517. doi:10.1016/S0964-1807(97)00042-2
Large grain melt processed Y-Ba-Cu-O (YBCO) samples have been prepared by seeded and unseeded growth techniques. The current carrying ability within individual grains and across grain boundaries has been investigated and correlated with features in the microstructure of samples fabricated by both...
Peer reviewed
Stassen, S., Cloots, R., Vanderbemden, P., Godelaine, P. A., Bougrine, H., Rulmont, A., & Ausloos, M. (1996). Magnetic alignment in 2212 Bi-based superconducting system .1. Magnetic orientation of Bi2Sr2Ca1-x(RE)(x)Cu2O8-y [(RE)=Gd, Dy, Ho, Er] powder dispersed in epoxy resin at room temperature. Journal of Materials Research, 11 (5), 1082-1085. doi:10.1557/JMR.1996.0137
The magnetic anisotropy of rare-earth substituted 2212 materials (Bi(2)Sr(2)Ca(0.8)RE(0.2)Cu(2)O(x) with RE = Gd, Dy, Ho, Er) is put into evidence. Superconducting powder dispersed in epoxy resin is oriented under an external magnetic field (4 T) in a direction that depends on the nature of the r...
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Stassen, S., Cloots, R., Vanderschueren, A., Vanderbemden, P., & Ausloos, M. (1996). Chemical composition, microstructure and physical properties of magnetically melt-textured bulk Bi2Sr2Ca0.8Dy0.2Cu2O8-y superconducting ceramics. In U. Balachandran, P. J. McGinn, ... J. S. Abell (Eds.), High Temperature Superconductors: Synthesis, Processing, and Large-Scale Applications (pp. 177-186). Warrendale, United States: TMS.
Dysprosium doped Bi-based 2212 ceramics were synthesized by a melt-texturing growth process in a 1.2 T magnetic field, applied perpendicularly to the main axis of a cylindrical shape sample. Four well oriented and chemically defined phases forming successive layers were observed and characterized...
Peer reviewed
Stassen, S., Rulmont, A., Vanderbemden, P., Vanderschueren, A., Gabelica, Z., Cloots, R., & Ausloos, M. (1996). Magnetic texturing of bulk samples of the superconductor Bi2Sr2Ca0.8Dy0.2Cu2O8-y. Journal of Applied Physics, 79 (1), 553-555. doi:10.1063/1.360864
The texturing process of Bi-Sr-Ca(Dy)-Cu-O (2212) is optimized by sintering under a magnetic field. The precursor crystalline powder is melted and grown under a 1.2 T magnetic field. Textured samples are characterized by x-ray diffraction, scanning electron microscopy, electrical resistivity, and...
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Vanderbemden, P., Vanderschueren, H., Stassen, S., Cloots, R., & Ausloos, M. (1996). Anisotropic field percolation and high current density in 2212 Bi-based substituted with Dy bulk magnetically textured composite ceramics. In T. Matsushita & K. Yamafuji (Eds.), Proceedings of the 8th International Workshop on Critical Currents in Superconductors (pp. 255-258). World Scientific.
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Dang, A., Godelaine, P. A., Vanderbemden, P., Cloots, R., & Ausloos, M. (1995). Intragrain pinning strength depth dependence of 2223-(Bi,Pb)-based high critical Tc ceramics made by a vitreous route. Journal of Applied Physics, 77 (7), 3560-3562. doi:10.1063/1.358588
Campbell's method for measuring the critical current in superconductors has been used to obtain the critical current density and the pinning strength in Bi1.7Pb0.3Sr2Ca2Cu3O10−y ceramics synthesized by a vitreous route. The intragrain critical current is much higher than 10^5 A/cm2 at 40 K in zer...
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Vanderbemden, P. (1995). Réalisation d'un appareillage mesure de l'anisotropie magnétique et application aux supraconducteurs à haute température critique. Bulletin Scientifique de l'Association des Ingénieurs Électriciens sortis de l'Institut Électrotechnique Montefiore, 12, 12-24.